1: # The LearningOnline Network with CAPA
2: #
3: # $Id: lonproblemanalysis.pm,v 1.94 2004/10/15 16:50:30 matthew Exp $
4: #
5: # Copyright Michigan State University Board of Trustees
6: #
7: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
8: #
9: # LON-CAPA is free software; you can redistribute it and/or modify
10: # it under the terms of the GNU General Public License as published by
11: # the Free Software Foundation; either version 2 of the License, or
12: # (at your option) any later version.
13: #
14: # LON-CAPA is distributed in the hope that it will be useful,
15: # but WITHOUT ANY WARRANTY; without even the implied warranty of
16: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17: # GNU General Public License for more details.
18: #
19: # You should have received a copy of the GNU General Public License
20: # along with LON-CAPA; if not, write to the Free Software
21: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22: #
23: # /home/httpd/html/adm/gpl.txt
24: #
25: # http://www.lon-capa.org/
26: #
27: package Apache::lonproblemanalysis;
28:
29: use strict;
30: use Apache::lonnet();
31: use Apache::loncommon();
32: use Apache::lonhtmlcommon();
33: use Apache::loncoursedata();
34: use Apache::lonstatistics;
35: use Apache::lonlocal;
36: use Apache::lonstathelpers();
37: use Apache::lonstudentsubmissions();
38: use HTML::Entities();
39: use Time::Local();
40: use Spreadsheet::WriteExcel();
41:
42: my $plotcolors = ['#33ff00',
43: '#0033cc', '#990000', '#aaaa66', '#663399', '#ff9933',
44: '#66ccff', '#ff9999', '#cccc33', '#660000', '#33cc66',
45: ];
46:
47: my @SubmitButtons = ({ name => 'PrevProblemAnalysis',
48: text => 'Previous Problem' },
49: { name => 'ProblemAnalysis',
50: text => 'Analyze Problem Again' },
51: { name => 'NextProblemAnalysis',
52: text => 'Next Problem' },
53: { name => 'break'},
54: { name => 'SelectAnother',
55: text => 'Choose a different Problem' },
56: { name => 'ExcelOutput',
57: text => 'Produce Excel Output' });
58:
59: sub BuildProblemAnalysisPage {
60: my ($r,$c)=@_;
61: #
62: my %Saveable_Parameters = ('Status' => 'scalar',
63: 'Section' => 'array',
64: 'NumPlots' => 'scalar',
65: 'AnalyzeOver' => 'scalar',
66: );
67: &Apache::loncommon::store_course_settings('problem_analysis',
68: \%Saveable_Parameters);
69: &Apache::loncommon::restore_course_settings('problem_analysis',
70: \%Saveable_Parameters);
71: #
72: &Apache::lonstatistics::PrepareClasslist();
73: #
74: $r->print(&CreateInterface());
75: #
76: my @Students = @Apache::lonstatistics::Students;
77: #
78: if (@Students < 1 && exists($ENV{'form.firstrun'})) {
79: $r->print('<h2>There are no students in the sections selected</h2>');
80: }
81: #
82: my @CacheButtonHTML =
83: &Apache::lonstathelpers::manage_caches($r,'Statistics','stats_status');
84: $r->rflush();
85: #
86: # Support for numerical and radio response isn't complete enough to
87: # include in 1.2 release.
88: # my $problem_types = '(option|radiobutton|numerical)';
89: my $problem_types = '.';#(option)';
90: if (exists($ENV{'form.problemchoice'}) &&
91: ! exists($ENV{'form.SelectAnother'})) {
92: foreach my $button (@SubmitButtons) {
93: if ($button->{'name'} eq 'break') {
94: $r->print("<br />\n");
95: } else {
96: $r->print('<input type="submit" name="'.$button->{'name'}.'" '.
97: 'value="'.&mt($button->{'text'}).'" />');
98: $r->print(' 'x5);
99: }
100: }
101: foreach my $html (@CacheButtonHTML) {
102: $r->print($html.(' 'x5));
103: }
104: #
105: $r->print('<hr />');
106: $r->rflush();
107: #
108: # Determine which problem we are to analyze
109: my $current_problem = &Apache::lonstathelpers::get_target_from_id
110: ($ENV{'form.problemchoice'});
111: #
112: my ($prev,$curr,$next) =
113: &Apache::lonstathelpers::get_prev_curr_next($current_problem,
114: $problem_types,
115: 'response',
116: );
117: if (exists($ENV{'form.PrevProblemAnalysis'}) && defined($prev)) {
118: $current_problem = $prev;
119: } elsif (exists($ENV{'form.NextProblemAnalysis'}) && defined($next)) {
120: $current_problem = $next;
121: } else {
122: $current_problem = $curr;
123: }
124: #
125: # Store the current problem choice and send it out in the form
126: $ENV{'form.problemchoice'} =
127: &Apache::lonstathelpers::make_target_id($current_problem);
128: $r->print('<input type="hidden" name="problemchoice" value="'.
129: $ENV{'form.problemchoice'}.'" />');
130: #
131: if (! defined($current_problem->{'resource'})) {
132: $r->print('resource is undefined');
133: } else {
134: my $resource = $current_problem->{'resource'};
135: $r->print('<h1>'.$resource->{'title'}.'</h1>');
136: $r->print('<h3>'.$resource->{'src'}.'</h3>');
137: if ($ENV{'form.show_prob'} eq 'true') {
138: $r->print(&Apache::lonstathelpers::render_resource($resource));
139: }
140: $r->rflush();
141: my %Data = &Apache::lonstathelpers::get_problem_data
142: ($resource->{'src'});
143: my $problem_data = $Data{$current_problem->{'part'}.
144: '.'.
145: $current_problem->{'respid'}};
146: if ($current_problem->{'resptype'} eq 'option') {
147: &OptionResponseAnalysis($r,$current_problem,
148: $problem_data,
149: \@Students);
150: } elsif ($current_problem->{'resptype'} eq 'radiobutton') {
151: &RadioResponseAnalysis($r,$current_problem,
152: $problem_data,
153: \@Students);
154: } elsif ($current_problem->{'resptype'} eq 'numerical') {
155: ##
156: ## analyze all responses of a problem at once
157: my $res = $current_problem->{'resource'};
158: foreach my $partid (@{$res->{'parts'}}) {
159: $current_problem->{'part'} = $partid;
160: foreach my $respid (@{$res->{'partdata'}->{$partid}->{'ResponseIds'}}) {
161: $current_problem->{'respid'}=$respid;
162: &NumericalResponseAnalysis($r,$current_problem,
163: $problem_data,\@Students);
164: }
165: }
166: } else {
167: $r->print('<h2>This analysis is not supported</h2>');
168: }
169: }
170: $r->print('<hr />');
171: } else {
172: $r->print('<input type="submit" name="ProblemAnalysis" value="'.
173: &mt('Analyze Problem').'" />');
174: $r->print(' 'x5);
175: $r->print('<h3>'.&mt('Please select a problem to analyze').'</h3>');
176: $r->print(&Apache::lonstathelpers::ProblemSelector
177: ($problem_types));
178: }
179: }
180:
181:
182: #########################################################
183: #########################################################
184: ##
185: ## Numerical Response Routines
186: ##
187: #########################################################
188: #########################################################
189: sub NumericalResponseAnalysis {
190: my ($r,$problem,$problem_data,$Students) = @_;
191: my $c = $r->connection();
192: my ($resource,$partid,$respid) = ($problem->{'resource'},
193: $problem->{'part'},
194: $problem->{'respid'});
195: #
196: if (scalar(@{$resource->{'parts'}})>1) {
197: if (@{$resource->{'partdata'}->{$partid}->{'ResponseIds'}}>1) {
198: $r->print('<h3>'.
199: &mt('Part [_1], response [_2].',$partid,$respid).
200: '</h3>');
201: } else {
202: $r->print('<h3>'.
203: &mt('Part [_1]',$partid,$respid).
204: '</h3>');
205: }
206: } elsif (@{$resource->{'partdata'}->{$partid}->{'ResponseIds'}}>1) {
207: $r->print('<h3>'.&mt('Response [_1]',$respid).'</h3>');
208: }
209: #
210: my $analysis_html;
211: my $PerformanceData = &Apache::loncoursedata::get_response_data
212: (\@Apache::lonstatistics::SelectedSections,
213: $Apache::lonstatistics::enrollment_status,
214: $resource->{'symb'},$respid);
215: if (! defined($PerformanceData) ||
216: ref($PerformanceData) ne 'ARRAY' ) {
217: $analysis_html = '<h2>'.
218: &mt('There is no submission data for this resource').
219: '</h2>';
220: $r->print($analysis_html);
221: return;
222: }
223: #
224: # This next call causes all the waiting around that people complain about
225: &Apache::lonstathelpers::GetStudentAnswers($r,$problem,$Students,
226: 'Statistics',
227: 'stats_status');
228: return if ($c->aborted());
229: #
230: # Collate the data
231: my %Data;
232: foreach my $student (@$Students) {
233: my $answer = $student->{'answer'};
234: $Data{$answer}++;
235: }
236: my @Labels = sort {$a <=> $b } keys(%Data);
237: my @PlotData = @Data{@Labels};
238: #
239: my $width = 500;
240: my $height = 100;
241: my $plot = &one_dimensional_plot($r,500,100,scalar(@$Students),
242: \@Labels,\@PlotData);
243: $r->print($plot);
244: return;
245: }
246:
247: sub one_dimensional_plot {
248: my ($r,$width,$height,$N,$Labels,$Data)=@_;
249: #
250: # Compute data -> image scaling factors
251: my $min = $Labels->[0];
252: my $max = $Labels->[-1];
253: if ($max == $min) {
254: $max =$min+1;
255: }
256: my $h_scale = ($width-10)/($max-$min);
257: #
258: my $max_y = 0;
259: foreach (@$Data) {
260: $max_y = $_ if ($max_y < $_);
261: }
262: my $ticscale = 5;
263: if ($max_y * $ticscale > $height/2) {
264: $ticscale = int($height/2/$max_y);
265: $ticscale = 1 if ($ticscale < 1);
266: }
267: #
268: # Create the plot
269: my $plot =
270: qq{<drawimage width="$width" height="$height" bgcolor="transparent" >};
271: for (my $idx=0;$idx<scalar(@$Labels);$idx++) {
272: my $xloc = 5+$h_scale*($Labels->[$idx] - $min);
273: my $top = $height/2-$Data->[$idx]*$ticscale;
274: my $bottom = $height/2+$Data->[$idx]*$ticscale;
275: $plot .=
276: &line($xloc,$top,$xloc,$bottom,'888888',1);
277: }
278: #
279: # Put the scale on last to ensure it is on top of the data.
280: if ($min < 0 && $max > 0) {
281: my $circle_x = 5+$h_scale*abs($min); # '0' in data coordinates
282: my $r = 4;
283: $plot .= &line(5,$height/2,$circle_x-$r,$height/2,'000000',1);
284: $plot .= &circle($circle_x,$height/2,$r+1,'000000');
285: $plot .= &line($circle_x+$r,$height/2,$width-5,$height/2,'000000',1);
286: } else {
287: $plot .= &line(5,$height/2,$width-5,$height/2,'000000',1);
288: }
289: $plot .= '</drawimage>';
290: my $plotresult = &Apache::lonxml::xmlparse($r,'web',$plot);
291:
292: my $title = 'Distribution of correct answers';
293: my $result = '<table>'.
294: '<tr><td colspan="3" align="center">'.
295: '<font size="+2">'.$title.' (N='.$N.')'.
296: '</font>'.
297: '</td></tr>'.
298: '<tr>'.
299: '<td valign="center">'.$min.'</td>'.
300: '<td>'.$plotresult.'</td>'.
301: '<td valign="center">'.$max.'</td>'.
302: '</tr>'.
303: '<tr><td colspan="3" align="center">'.
304: 'Maximum Number of Coinciding Values: '.$max_y.
305: '</td></tr>'.
306: '</table>';
307: return $result;
308: }
309:
310: ##
311: ## Helper subroutines for <drawimage>.
312: ## These should probably go somewhere more suitable soon.
313: sub line {
314: my ($x1,$y1,$x2,$y2,$color,$thickness) = @_;
315: return qq{<line x1="$x1" y1="$y1" x2="$x2" y2="$y2" color="$color" thickness="$thickness" />$/};
316: }
317:
318: sub text {
319: my ($x,$y,$color,$text,$font,$direction) = @_;
320: if (! defined($font) || $font !~ /^(tiny|small|medium|large|giant)$/) {
321: $font = 'medium';
322: }
323: if (! defined($direction) || $direction ne 'vertical') {
324: $direction = '';
325: }
326: return qq{<text x="$x" y="$y" color="$color" font="$font" direction="$direction" >$text</text>};
327: }
328:
329: sub rectangle {
330: my ($x1,$y1,$x2,$y2,$color,$thickness,$filled) = @_;
331: return qq{<rectangle x1="$x1" y1="$y1" x2="$x2" y2="$y2" color="$color" thickness="$thickness" filled="$filled" />};
332: }
333:
334: sub arc {
335: my ($x,$y,$width,$height,$start,$end,$color,$thickness,$filled)=@_;
336: return qq{<arc x="$x" y="$y" width="$width" height="$height" start="$start" end="$end" color="$color" thickness="$thickness" filled="$filled" />};
337: }
338:
339: sub circle {
340: my ($x,$y,$radius,$color,$thickness,$filled)=@_;
341: return &arc($x,$y,$radius,$radius,0,360,$color,$thickness,$filled);
342: }
343:
344: sub build_student_data_worksheet {
345: my ($workbook,$format) = @_;
346: my $rows_output = 3;
347: my $cols_output = 0;
348: my $worksheet = $workbook->addworksheet('Student Data');
349: $worksheet->write($rows_output++,0,'Student Data',$format->{'h3'});
350: my @Headers = ('full name','username','domain','section',
351: "student\nnumber",'identifier');
352: $worksheet->write_row($rows_output++,0,\@Headers,$format->{'header'});
353: my @Students = @Apache::lonstatistics::Students;
354: my $studentrows = &Apache::loncoursedata::get_student_data(\@Students);
355: my %ids;
356: foreach my $row (@$studentrows) {
357: my ($mysqlid,$student) = @$row;
358: $ids{$student}=$mysqlid;
359: }
360: foreach my $student (@Students) {
361: my $name_domain = $student->{'username'}.':'.$student->{'domain'};
362: $worksheet->write_row($rows_output++,0,
363: [$student->{'fullname'},
364: $student->{'username'},$student->{'domain'},
365: $student->{'section'},$student->{'id'},
366: $ids{$name_domain}]);
367: }
368: return $worksheet;
369: }
370:
371: #########################################################
372: #########################################################
373: ##
374: ## Radio Response Routines
375: ##
376: #########################################################
377: #########################################################
378: sub RadioResponseAnalysis {
379: my ($r,$problem,$problem_analysis,$students) = @_;
380: if ($ENV{'form.AnalyzeOver'} eq 'tries') {
381: &RR_tries_analysis($r,$problem,$problem_analysis,$students);
382: } elsif ($ENV{'form.AnalyzeOver'} eq 'time') {
383: &RR_static_time_analysis($r,$problem,$problem_analysis,$students);
384: } else {
385: $r->print('Bad request');
386: }
387: return;
388: }
389:
390: sub RR_computed_tries_analysis {
391: my ($r,$problem,$problem_analysis) = @_;
392: my ($resource,$partid,$respid) = ($problem->{'resource'},
393: $problem->{'part'},
394: $problem->{'respid'});
395: $r->print('The tries answer you seek must be computed');
396: # Gather student data
397: # for each try
398: # loop through data, classifying it by
399: # correct foil -> selected foil
400: # if there is concept data
401: # make a concept correct plot
402: # for each correct foil
403: # make a plot of the data
404: }
405:
406: sub RR_computed_time_analysis {
407: my ($r,$problem,$problem_analysis) = @_;
408: my ($resource,$partid,$respid) = ($problem->{'resource'},
409: $problem->{'part'},
410: $problem->{'respid'});
411: $r->print('The time answer you seek must be computed');
412: # Gather student data
413: # for time division
414: # limit to between start time & end time
415: # loop through data, classifying it by
416: # correct foil -> selected foil
417: # if there is concept data
418: # make a concept correct plot
419: # for each correct foil
420: # make a plot of the data
421: }
422:
423: sub RR_tries_analysis {
424: my ($r,$problem,$problem_analysis,$students) = @_;
425: my ($resource,$partid,$respid) = ($problem->{'resource'},
426: $problem->{'part'},
427: $problem->{'respid'});
428: #
429: my $analysis_html;
430: my $foildata = $problem_analysis->{'_Foils'};
431: my ($table,$foils,$concepts) = &build_foil_index($problem_analysis);
432: $analysis_html .= $table;
433: # Gather student data
434: my $response_data = &Apache::loncoursedata::get_response_data
435: (\@Apache::lonstatistics::SelectedSections,
436: $Apache::lonstatistics::enrollment_status,
437: $resource->{'symb'},$respid);
438: my $correct; # either a hash reference or a scalar
439: if ($problem_analysis->{'answercomputed'} || scalar(@$concepts) > 1) {
440: # This takes a while for large classes...
441: &Apache::lonstathelpers::GetStudentAnswers($r,$problem,$students,
442: 'Statistics',
443: 'stats_status');
444: foreach my $student (@$students) {
445: my ($idx,@remainder) = split('&',$student->{'answer'});
446: my ($answer) = ($remainder[$idx]=~/^(.*)=([^=]*)$/);
447: $correct->{$student->{'username'}.':'.$student->{'domain'}}=
448: &Apache::lonnet::unescape($answer);
449: }
450: } else {
451: foreach my $foil (keys(%$foildata)) {
452: if ($foildata->{$foil}->{'value'} eq 'true') {
453: $correct = $foildata->{$foil}->{'name'};
454: last;
455: }
456: }
457: }
458: if (! defined($response_data) ||
459: ref($response_data) ne 'ARRAY' ) {
460: $analysis_html = '<h2>'.
461: &mt('There is no submission data for this resource').
462: '</h2>';
463: $r->print($analysis_html);
464: return;
465: }
466: #
467: $analysis_html.='<table>';
468: for (my $try = 1;$try<=$ENV{'form.NumPlots'};$try++) {
469: # classify data ->correct foil -> selected foil
470: my $attempt_restriction_function =
471: my $foil_choice_data =
472: &RR_classify_response_data($response_data,$correct,
473: sub {($_[0]->{'tries'} == $try?1:0)});
474: my $answers;
475: if (ref($correct)) {
476: my %tmp;
477: foreach my $foil (values(%$correct)) {
478: $tmp{$foil}++;
479: }
480: $answers = [keys(%tmp)];
481: } else {
482: $answers = [$correct];
483: }
484: # Concept Plot
485: my $concept_plot = '';
486: if (scalar(@$concepts) > 1) {
487: $concept_plot = &RR_concept_plot($concepts,$foil_choice_data,
488: '% choosing');
489: }
490: # % Choosing plot
491: my $choice_plot = &RR_create_percent_selected_plot
492: ($foils,$foil_choice_data,'Attempt '.$try);
493: # for each correct foil, how did they mark it? (stacked bar graph)
494: my ($stacked_plot,$count_by_foil) =
495: &RR_create_stacked_selection_plot($foils,$foil_choice_data,'');
496: #
497: if ($concept_plot ne '' ||
498: $choice_plot ne '' ||
499: $stacked_plot ne '') {
500: $analysis_html.=
501: '<tr>'.
502: '<td>'.$concept_plot.'</td>'.
503: '<td>'.$choice_plot.'</td>';
504: if ($stacked_plot ne '') {
505: $analysis_html .=
506: '<td>'.$stacked_plot.'</td>'.
507: '<td>'.&build_foil_key($foils,$count_by_foil).'</td>';
508: } else {
509: $analysis_html .= ('<td></td>'x2);
510: }
511: $analysis_html.='</tr>'.$/;
512: }
513: }
514: $analysis_html.='</table>';
515: $r->print($analysis_html);
516: }
517:
518:
519: sub RR_concept_plot {
520: my ($concepts,$foil_data,$title) = @_;
521: #
522: my %correct_by_concept;
523: my %incorrect_by_concept;
524: my %true;
525: foreach my $concept (@$concepts) {
526: foreach my $foil (@{$concept->{'foils'}}) {
527: next if (! exists($foil_data->{$foil}));
528: foreach my $choice (keys(%{$foil_data->{$foil}})) {
529: if ($choice eq $foil) {
530: $correct_by_concept{$concept->{'name'}} +=
531: $foil_data->{$foil}->{$choice};
532: } else {
533: $incorrect_by_concept{$concept->{'name'}} +=
534: $foil_data->{$foil}->{$choice};
535:
536: }
537: }
538: }
539: }
540: #
541: # need arrays for incorrect and correct because we want to use different
542: # colors for them
543: my @correct;
544: #
545: my $total =0;
546: for (my $i=0;$i<scalar(@$concepts);$i++) {
547: my $concept = $concepts->[$i];
548: $correct[$i] = $correct_by_concept{$concept->{'name'}};
549: $total += $correct_by_concept{$concept->{'name'}}+
550: $incorrect_by_concept{$concept->{'name'}};
551: }
552: if ($total == 0) { return ''; };
553: for (my $i=0;$i<=$#correct;$i++) {
554: $correct[$i] = sprintf('%0f',$correct[$i]/$total*100);
555: }
556: my $xlabel = 'concept';
557: $title.= ' (N='.$total.')';
558: my $plot= &Apache::loncommon::DrawBarGraph($title,
559: $xlabel,
560: 'Percent Choosing',
561: 100,
562: ['#33ff00','#ff3300'],
563: undef,
564: \@correct);
565: return $plot;
566: }
567:
568:
569: sub RR_create_percent_selected_plot {
570: my ($foils,$foil_data,$title) = @_;
571: #
572: my %foil_selections;
573: my %true;
574: foreach my $foil (@$foils) {
575: # foil_data has format $foil_data->{true_foil}->{selected foil}
576: next if (! exists($foil_data->{$foil}));
577: $true{$foil}++;
578: while (my ($f,$count)= each(%{$foil_data->{$foil}})) {
579: $foil_selections{$f}+=$count;
580: }
581: }
582: #
583: # need arrays for incorrect and correct because we want to use different
584: # colors for them
585: my @correct;
586: my @incorrect;
587: #
588: my $total =0;
589: for (my $i=0;$i<scalar(@$foils);$i++) {
590: my $foil = $foils->[$i];
591: if ($true{$foil}) {
592: $correct[$i] = $foil_selections{$foil};
593: $incorrect[$i] = 0;
594: } else {
595: $correct[$i] = 0;
596: $incorrect[$i] = $foil_selections{$foil};
597: }
598: $total+=$foil_selections{$foil};
599: }
600: if ($total == 0) { return ''; };
601: for (my $i=0;$i<=$#correct;$i++) {
602: $correct[$i] = sprintf('%0f',$correct[$i]/$total*100);
603: }
604: for (my $i=0;$i<=$#incorrect;$i++) {
605: $incorrect[$i] = sprintf('%0f',$incorrect[$i]/$total*100);
606: }
607: my $xlabel = 'foil chosen';
608: $title.= ' (N='.$total.')';
609: my $plot= &Apache::loncommon::DrawBarGraph($title,
610: $xlabel,
611: 'Percent Choosing',
612: 100,
613: ['#33ff00','#ff3300'],
614: undef,
615: \@correct,
616: \@incorrect);
617: return $plot;
618: }
619:
620:
621: sub RR_create_stacked_selection_plot {
622: my ($foils,$foil_data,$title)=@_;
623: #
624: my @correct_choice; # the green row
625: my @dataset; # array of array refs - multicolor rows.
626: my %filled;
627: my @labels;
628: my $count=-1;
629: my %column;
630: for (my $i=0;$i<scalar(@$foils);$i++) {
631: next if (! exists($foil_data->{$foils->[$i]}));
632: my $correct_foil = $foils->[$i];
633: push(@labels,$i+1);
634: $column{$correct_foil}= ++$count;
635: for (my $j=0;$j<scalar(@$foils);$j++) {
636: my $value = 0;
637: if ($i != $j ) {
638: $value += $foil_data->{$correct_foil}->{$foils->[$j]};
639: }
640: $dataset[$j]->[$column{$correct_foil}]=$value;
641: }
642: }
643: #
644: return '' if (! scalar(keys(%column)));
645: #
646: my $grand_total = 0;
647: my %count_per_foil;
648: while (my ($foil,$bar) = each (%column)) {
649: my $bar_total = 0;
650: for (my $j=0;$j<scalar(@dataset);$j++) {
651: $bar_total += $dataset[$j]->[$bar];
652: }
653: next if ($bar_total == 0);
654: for (my $j=0;$j<scalar(@dataset);$j++) {
655: $dataset[$j]->[$bar] =
656: sprintf('%2f',$dataset[$j]->[$bar]/$bar_total * 100);
657: }
658: $count_per_foil{$foil}=' (N='.$bar_total.')';
659: $grand_total += $bar_total;
660: }
661: if ($grand_total == 0) {
662: return ('',undef);
663: }
664: my @empty_row = ();
665: foreach (@{$dataset[0]}) {
666: push(@empty_row,0);
667: }
668: #
669: $title .= ' (N='.$grand_total.')';
670: my $graph = &Apache::loncommon::DrawBarGraph
671: ($title,'Correct Foil','foils chosen Incorrectly',
672: 100,$plotcolors,\@labels,\@empty_row,@dataset);
673: return ($graph,\%count_per_foil);
674: }
675:
676:
677: # if $correct is a hash ref, it is assumed to be indexed by student names.
678: # the values are assumed to be hash refs with a key of 'answer'.
679: sub RR_classify_response_data {
680: my ($full_row_data,$correct,$function) = @_;
681: my %submission_data;
682: foreach my $row (@$full_row_data) {
683: my %subm = &hashify_attempt($row);
684: if (ref($correct) eq 'HASH') {
685: $subm{'correct'} = $correct->{$subm{'student'}};
686: } else {
687: $subm{'correct'} = $correct;
688: }
689: $subm{'submission'} =~ s/=\d+\s*$//;
690: if (&$function(\%subm)) {
691: $submission_data{$subm{'correct'}}->{$subm{'submission'}}++;
692: }
693: }
694: return \%submission_data;
695: }
696:
697: sub RR_static_time_analysis {
698: my ($r,$problem,$problem_analysis) = @_;
699: my ($resource,$partid,$respid) = ($problem->{'resource'},
700: $problem->{'part'},
701: $problem->{'respid'});
702: $r->print('<h3>The time answer you seek is static</h3>');
703: my $analysis_html;
704: # Gather student data
705: my $response_data = &Apache::loncoursedata::get_response_data
706: (\@Apache::lonstatistics::SelectedSections,
707: $Apache::lonstatistics::enrollment_status,
708: $resource->{'symb'},$respid);
709: if (! defined($response_data) ||
710: ref($response_data) ne 'ARRAY' ) {
711: $analysis_html = '<h2>'.
712: &mt('There is no submission data for this resource').
713: '</h2>';
714: $r->print($analysis_html);
715: return;
716: }
717: # for time division
718:
719: # limit to between start time & end time
720: # loop through data, classifying it by
721: # correct foil -> selected foil
722: # if there is concept data
723: # make a concept correct plot
724: # for each correct foil
725: # make a plot of the data
726:
727: }
728:
729:
730: =pod
731:
732:
733: } elsif ($ENV{'form.AnalyzeOver'} eq 'tries') {
734: $analysis_html .= &RR_tries_Analysis($r,$problem->{'resource'},
735: $PerformanceData,$problem_data);
736: } elsif ($ENV{'form.AnalyzeOver'} eq 'time') {
737: $analysis_html .= &RR_time_Analysis($r,$problem->{'resource'},
738: $PerformanceData,$problem_data);
739: } else {
740: $analysis_html .= '<h2>'.
741: &mt('The analysis you have selected is not supported at this time').
742: '</h2>';
743: }
744: $r->print($analysis_html);
745: }
746:
747: sub RR_Excel_output {
748: my ($r,$PerformanceData,$problem_data) = @_;
749: return '<h1>No!</h1>';
750: }
751:
752: sub RR_tries_Analysis {
753: my ($r,$resource,$PerformanceData,$problem_data) = @_;
754: my $analysis_html;
755: my $mintries = 1;
756: my $maxtries = $ENV{'form.NumPlots'};
757: my ($table,$Foils,$Concepts) = &build_foil_index($problem_data);
758: if ((! defined($Concepts)) || (@$Concepts < 2)) {
759: $table = '<h3>'.
760: &mt('Not enough data for concept analysis. '.
761: 'Performing Foil Analysis').
762: '</h3>'.$table;
763: }
764: $analysis_html .= $table;
765: my @TryData = &RR_tries_data_analysis($r,$PerformanceData);
766: $analysis_html .= &RR_tries_Foil_Analysis($mintries,$maxtries,$Foils,
767: \@TryData,$problem_data);
768: return $analysis_html;
769: }
770:
771: sub RR_tries_data_analysis {
772: my ($r,$Attempt_data) = @_;
773: my @TryData;
774: foreach my $attempt (@$Attempt_data) {
775: my %Attempt = &hashify_attempt($attempt);
776: my ($answer,undef) = split('=',$Attempt{'submission'});
777: $TryData[$Attempt{'tries'}]->{$answer}++;
778: }
779: return @TryData;
780: }
781:
782: sub RR_time_Analysis {
783: my ($r,$PerformanceData,$problem_data) = @_;
784: my $html;
785: return $html;
786: }
787:
788: sub RR_tries_Foil_Analysis {
789: my ($min,$max,$Foils,$TryData,$problem_data) = @_;
790: my $html;
791: #
792: # Compute the data neccessary to make the plots
793: for (my $try=$min;$try<=$max;$try++) {
794: my @PlotData_Correct;
795: my @PlotData_Incorrect;
796: next if ($try > scalar(@{$TryData}));
797: next if (! defined($TryData->[$try]));
798: my %DataSet = %{$TryData->[$try]};
799: my $total = 0;
800: foreach my $foilid (@$Foils) {
801: $total += $DataSet{$foilid};
802: }
803: foreach my $foilid (@$Foils) {
804: if ($total == 0) {
805: push (@PlotData_Correct,0);
806: push (@PlotData_Incorrect,0);
807: } else {
808: if ($problem_data->{'_Foils'}->{$foilid}->{'value'} eq 'true') {
809: push (@PlotData_Correct,
810: int(100*$DataSet{$foilid}/$total));
811: push (@PlotData_Incorrect,0);
812: } else {
813: push (@PlotData_Correct,0);
814: push (@PlotData_Incorrect,
815: int(100*$DataSet{$foilid}/$total));
816: }
817: }
818: }
819: my $title='Attempt '.$try.' (N='.$total.')';
820: my $xlabel = 'Foil Chosen';
821: $html.= &Apache::loncommon::DrawBarGraph($title,
822: $xlabel,
823: 'Percent Choosing',
824: 100,
825: ['#33ff00','#ff3300'],
826: undef,
827: \@PlotData_Correct,
828: \@PlotData_Incorrect);
829: }
830: return $html;
831: }
832:
833: sub RR_tries_Concept_Analysis {
834: my ($min,$max,$Concepts,$ResponseData,$problem_data) = @_;
835: my $html;
836: return $html;
837: }
838:
839: sub RR_time_Foil_Analysis {
840: my ($min,$max,$Foils,$ResponseData,$problem_data) = @_;
841: my $html;
842: return $html;
843: }
844:
845: sub RR_time_Concept_Analysis {
846: my ($min,$max,$Concepts,$ResponseData,$problem_data) = @_;
847: my $html;
848: return $html;
849: }
850:
851:
852: sub get_Radio_problem_data {
853: my ($url) = @_;
854: my $Answ=&Apache::lonnet::ssi($url,('grade_target' => 'analyze'));
855: (my $garbage,$Answ)=split('_HASH_REF__',$Answ,2);
856: my %Answer = &Apache::lonnet::str2hash($Answ);
857: my %Partdata;
858: foreach my $part (@{$Answer{'parts'}}) {
859: while (my($key,$value) = each(%Answer)) {
860: # if (ref($value) eq 'ARRAY') {
861: # &Apache::lonnet::logthis('is ref part:'.$part.' '.$key.'='.join(',',@$value));
862: # } else {
863: # &Apache::lonnet::logthis('notref part:'.$part.' '.$key.'='.$value);
864: # }
865: next if ($key !~ /^$part/);
866: $key =~ s/^$part\.//;
867: if ($key eq 'foils') {
868: $Partdata{$part}->{'_Foils'}=$value;
869: } elsif ($key eq 'options') {
870: $Partdata{$part}->{'_Options'}=$value;
871: } elsif ($key eq 'shown') {
872: $Partdata{$part}->{'_Shown'}=$value;
873: } elsif ($key =~ /^foil.value.(.*)$/) {
874: $Partdata{$part}->{$1}->{'value'}=$value;
875: } elsif ($key =~ /^foil.text.(.*)$/) {
876: $Partdata{$part}->{$1}->{'text'}=$value;
877: }
878: }
879: }
880: return %Partdata;
881: }
882:
883: =cut
884:
885: #########################################################
886: #########################################################
887: ##
888: ## Option Response Routines
889: ##
890: #########################################################
891: #########################################################
892: sub OptionResponseAnalysis {
893: my ($r,$problem,$problem_data,$Students) = @_;
894: my ($resource,$respid) = ($problem->{'resource'},
895: $problem->{'respid'});
896: # Note: part data is not needed.
897: my $PerformanceData = &Apache::loncoursedata::get_response_data
898: (\@Apache::lonstatistics::SelectedSections,
899: $Apache::lonstatistics::enrollment_status,
900: $resource->{'symb'},$respid);
901: if (! defined($PerformanceData) ||
902: ref($PerformanceData) ne 'ARRAY' ) {
903: $r->print('<h2>'.
904: &mt('There is no student data for this problem.').
905: '</h2>');
906: } else {
907: $r->rflush();
908: if (exists($ENV{'form.ExcelOutput'})) {
909: my $result = &OR_excel_sheet($r,$resource,
910: $PerformanceData,
911: $problem_data);
912: $r->print($result);
913: $r->rflush();
914: } else {
915: if ($ENV{'form.AnalyzeOver'} eq 'tries') {
916: my $analysis_html = &OR_tries_analysis($r,
917: $PerformanceData,
918: $problem_data);
919: $r->print($analysis_html);
920: $r->rflush();
921: } elsif ($ENV{'form.AnalyzeOver'} eq 'time') {
922: my $analysis_html = &OR_time_analysis($PerformanceData,
923: $problem_data);
924: $r->print($analysis_html);
925: $r->rflush();
926: } else {
927: $r->print('<h2>'.
928: &mt('The analysis you have selected is '.
929: 'not supported at this time').
930: '</h2>');
931: }
932: }
933: }
934: }
935:
936: #########################################################
937: #
938: # Option Response: tries Analysis
939: #
940: #########################################################
941: sub OR_tries_analysis {
942: my ($r,$PerformanceData,$ORdata) = @_;
943: my $mintries = 1;
944: my $maxtries = $ENV{'form.NumPlots'};
945: my ($table,$Foils,$Concepts) = &build_foil_index($ORdata);
946: my %response_data = &OR_analyze_by_tries($r,$PerformanceData,
947: $mintries,$maxtries);
948: my $analysis = '';
949: #
950: # Compute the data necessary to make the plots
951: my @foil_plot;
952: my @concept_data;
953: for (my $j=0;$j<=scalar(@$Concepts);$j++) {
954: my $concept = $Concepts->[$j];
955: foreach my $foilid (@{$concept->{'foils'}}) {
956: for (my $try=$mintries;$try<=$maxtries;$try++) {
957: # concept analysis data
958: $concept_data[$j]->[$try]->{'_correct'} +=
959: $response_data{$foilid}->[$try]->{'_correct'};
960: $concept_data[$j]->[$try]->{'_total'} +=
961: $response_data{$foilid}->[$try]->{'_total'};
962: #
963: # foil analysis data
964: if ($response_data{$foilid}->[$try]->{'_total'} == 0) {
965: push(@{$foil_plot[$try]->{'_correct'}},0);
966: } else {
967: push(@{$foil_plot[$try]->{'_correct'}},
968: 100*$response_data{$foilid}->[$try]->{'_correct'}/
969: $response_data{$foilid}->[$try]->{'_total'});
970: }
971: foreach my $option (@{$ORdata->{'_Options'}}) {
972: push(@{$foil_plot[$try]->{'_total'}},
973: $response_data{$foilid}->[$try]->{'_total'});
974: if ($response_data{$foilid}->[$try]->{'_total'} == 0) {
975: push (@{$foil_plot[$try]->{$option}},0);
976: } else {
977: if ($response_data{$foilid}->[$try]->{'_total'} ==
978: $response_data{$foilid}->[$try]->{'_correct'}) {
979: push(@{$foil_plot[$try]->{$option}},0);
980: } else {
981: push (@{$foil_plot[$try]->{$option}},
982: 100 *
983: $response_data{$foilid}->[$try]->{$option} /
984: ($response_data{$foilid}->[$try]->{'_total'}
985: -
986: $response_data{$foilid}->[$try]->{'_correct'}
987: ));
988: }
989: }
990: } # End of foreach my $option
991: }
992: } # End of foreach my $foilid
993: } # End of concept loops
994: #
995: # Build a table for the plots
996: my $analysis_html = "<table>\n";
997: my $optionkey = &build_option_index($ORdata);
998: my $num_concepts = 1;
999: if (defined($Concepts)) { $num_concepts = scalar(@$Concepts); }
1000: #
1001: for (my $try=$mintries;$try<=$maxtries;$try++) {
1002: if (! defined($response_data{'_total'}->[$try]) ||
1003: $response_data{'_total'}->[$try] == 0) {
1004: if ($try > 1) {
1005: $analysis_html.= '<tr><td align="center" colspan="4"><b>'.
1006: &mt('None of the selected students attempted the problem more than [_1] times.',$try-1).
1007: '</b></td></tr>';
1008: } else {
1009: $analysis_html.= '<tr><td colspan="4" align="center"><b>'.
1010: &mt('None of the selected students have attempted the problem').'</b></td></tr>';
1011: }
1012: last;
1013: }
1014: my $concept_graph='';
1015: if ($num_concepts > 1) {
1016: #
1017: # Create concept plot
1018: my @concept_plot_data;
1019: for (my $j=0;$j<=$#concept_data;$j++) {
1020: my $total = $concept_data[$j]->[$try]->{'_total'};
1021: if ($total == 0) {
1022: $concept_plot_data[$j] = 0;
1023: } else {
1024: $concept_plot_data[$j] = 100 *
1025: sprintf('%0.3f',
1026: $concept_data[$j]->[$try]->{'_correct'} /
1027: $total);
1028: }
1029: }
1030: #
1031: my $title;
1032: my $count = $response_data{'_total'}->[$try];
1033: $title = 'Attempt '.$try.' (N='.$count.')';
1034: $concept_graph = &Apache::loncommon::DrawBarGraph
1035: ($title,'Concept Number','Percent Correct',
1036: 100,$plotcolors,undef,\@concept_plot_data);
1037: }
1038: #
1039: # Create Foil Plots
1040: my $count = $response_data{'_total'}->[$try];
1041: my $title = 'Attempt '.$try.' (N='.$count.')';
1042: my @Datasets;
1043: foreach my $option ('_correct',@{$ORdata->{'_Options'}}) {
1044: next if (! exists($foil_plot[$try]->{$option}));
1045: push(@Datasets,$foil_plot[$try]->{$option});
1046: }
1047: #
1048: # Put a blank in the data set between concepts
1049: for (my $set =0;$set<=$#Datasets;$set++) {
1050: my @Data = @{$Datasets[$set]};
1051: my $idx = 0;
1052: foreach my $concept (@{$Concepts}) {
1053: foreach my $foilid (@{$concept->{'foils'}}) {
1054: $Datasets[$set]->[$idx++]=shift(@Data);
1055: }
1056: if ($concept->{'name'} ne $Concepts->[-1]->{'name'}) {
1057: $Datasets[$set]->[$idx++] = 0;
1058: }
1059: }
1060: }
1061: #
1062: # Set up the labels needed for the bar graph
1063: my @Labels;
1064: my $idx = 1;
1065: foreach my $concept (@{$Concepts}) {
1066: foreach my $foilid (@{$concept->{'foils'}}) {
1067: push(@Labels,$idx++);
1068: }
1069: push(@Labels,'');
1070: }
1071: #
1072: my $correct_graph = &Apache::loncommon::DrawBarGraph
1073: ($title,'Foil Number','Percent Correct',
1074: 100,$plotcolors,\@Labels,$Datasets[0]);
1075:
1076: #
1077: #
1078: next if (! defined($Datasets[0]));
1079: for (my $i=0; $i< scalar(@{$Datasets[0]});$i++) {
1080: $Datasets[0]->[$i]=0;
1081: }
1082: $count = $response_data{'_total'}->[$try] -
1083: $response_data{'_correct'}->[$try];
1084: $title = 'Attempt '.$try.' (N='.$count.')';
1085: my $incorrect_graph = &Apache::loncommon::DrawBarGraph
1086: ($title,'Foil Number','% Option Chosen Incorrectly',
1087: 100,$plotcolors,\@Labels,@Datasets);
1088: $analysis_html.=
1089: '<tr>'.
1090: '<td>'.$concept_graph.'</td>'.
1091: '<td>'.$correct_graph.'</td>'.
1092: '<td>'.$incorrect_graph.'</td>'.
1093: '<td>'.$optionkey.'<td>'.
1094: '</tr>'.$/;
1095: }
1096: $analysis_html .= "</table>\n";
1097: $table .= $analysis_html;
1098: return $table;
1099: }
1100:
1101: sub OR_analyze_by_tries {
1102: my ($r,$PerformanceData,$mintries,$maxtries) = @_;
1103: my %Trydata;
1104: $mintries = 1 if (! defined($mintries) || $mintries < 1);
1105: $maxtries = $mintries if (! defined($maxtries) || $maxtries < $mintries);
1106: foreach my $row (@$PerformanceData) {
1107: next if (! defined($row));
1108: my $tries = &get_tries_from_row($row);
1109: my %Row = &Process_OR_Row($row);
1110: next if (! %Row);
1111: while (my ($foilid,$href) = each(%Row)) {
1112: if (! ref($href)) {
1113: $Trydata{$foilid}->[$tries] += $href;
1114: next;
1115: }
1116: while (my ($option,$value) = each(%$href)) {
1117: $Trydata{$foilid}->[$tries]->{$option}+=$value;
1118: }
1119: }
1120: }
1121: return %Trydata;
1122: }
1123:
1124: #########################################################
1125: #
1126: # Option Response: Time Analysis
1127: #
1128: #########################################################
1129: sub OR_time_analysis {
1130: my ($performance_data,$ORdata) = @_;
1131: my ($table,$Foils,$Concepts) = &build_foil_index($ORdata);
1132: my $foilkey = &build_option_index($ORdata);
1133: my $num_concepts = 1;
1134: if (defined($Concepts)) { $num_concepts = scalar(@$Concepts); }
1135: #
1136: if ($num_concepts < 2) {
1137: $table = '<h3>'.
1138: &mt('Not enough data for concept analysis. '.
1139: 'Performing Foil Analysis').
1140: '</h3>'.$table;
1141: }
1142: #
1143: my $num_plots = $ENV{'form.NumPlots'};
1144: my $num_data = scalar(@$performance_data)-1;
1145: my $percent = sprintf('%2f',100/$num_plots);
1146: #
1147: $table .= "<table>\n";
1148: for (my $i=0;$i<$num_plots;$i++) {
1149: ##
1150: my $starttime = &Apache::lonhtmlcommon::get_date_from_form
1151: ('startdate_'.$i);
1152: my $endtime = &Apache::lonhtmlcommon::get_date_from_form
1153: ('enddate_'.$i);
1154: if (! defined($starttime) || ! defined($endtime)) {
1155: my $sec_in_day = 86400;
1156: my $last_sub_time = &get_time_from_row($performance_data->[-1]);
1157: my ($sday,$smon,$syear);
1158: (undef,undef,undef,$sday,$smon,$syear) =
1159: localtime($last_sub_time - $sec_in_day*$i);
1160: $starttime = &Time::Local::timelocal(0,0,0,$sday,$smon,$syear);
1161: $endtime = $starttime + $sec_in_day;
1162: if ($i == ($num_plots -1 )) {
1163: $starttime = &get_time_from_row($performance_data->[0]);
1164: }
1165: }
1166: $table .= '<tr><td colspan="4" align="center">'.
1167: &mt('Data from [_1] to [_2]',
1168: &Apache::lonlocal::locallocaltime($starttime),
1169: &Apache::lonlocal::locallocaltime($endtime)).'</td></tr>'.$/;
1170: my $startdateform = &Apache::lonhtmlcommon::date_setter
1171: ('Statistics','startdate_'.$i,$starttime);
1172: my $enddateform = &Apache::lonhtmlcommon::date_setter
1173: ('Statistics','enddate_'.$i,$endtime);
1174: #
1175: my $begin_index;
1176: my $end_index;
1177: my $j;
1178: while (++$j < scalar(@$performance_data)) {
1179: last if (&get_time_from_row($performance_data->[$j])
1180: > $starttime);
1181: }
1182: $begin_index = $j;
1183: while ($j < scalar(@$performance_data)) {
1184: if (&get_time_from_row($performance_data->[$j]) > $endtime) {
1185: last;
1186: } else {
1187: $j++;
1188: }
1189: }
1190: $end_index = $j;
1191: ##
1192: my $interval = {
1193: begin_index => $begin_index,
1194: end_index => $end_index,
1195: startdateform => $startdateform,
1196: enddateform => $enddateform,
1197: };
1198: my $concept_correct_plot = '';
1199: if ($num_concepts > 1) {
1200: $concept_correct_plot =
1201: &OR_Concept_Time_Analysis($performance_data,
1202: $ORdata,$Concepts,
1203: $interval);
1204: }
1205: my ($foil_correct_plot,$foil_incorrect_plot) =
1206: &OR_Foil_Time_Analysis($performance_data,$ORdata,
1207: $Foils,$Concepts,$interval);
1208: $table .= '<tr>'.
1209: '<td>'.$concept_correct_plot.'</td>'.
1210: '<td>'.$foil_correct_plot.'</td>'.
1211: '<td>'.$foil_incorrect_plot.'</td>'.
1212: '<td align="left" valign="top">'.$foilkey.'</td></tr>'.$/;
1213: $table .= '<tr><td colspan="4" align="center">'.
1214: &mt('Start time: [_1]',
1215: $interval->{'startdateform'}).'<br />'.
1216: &mt('End time: [_1]',
1217: $interval->{'enddateform'}).
1218: '</td></tr>'.$/;
1219: $table.= '<tr><td colspan="4"> </td></tr>'.$/;
1220: }
1221: $table .= '</table>';
1222: #
1223: return $table;
1224: }
1225:
1226: sub OR_Foil_Time_Analysis {
1227: my ($performance_data,$ORdata,$Foils,$Concepts,$interval) = @_;
1228: my $analysis_html;
1229: my ($begin_index,$end_index) = ($interval->{'begin_index'},
1230: $interval->{'end_index'});
1231: my %TimeData;
1232: #
1233: # Compute the number getting the foils correct or incorrects
1234: for (my $j=$begin_index;$j<=$end_index;$j++) {
1235: my $row = $performance_data->[$j];
1236: next if (! defined($row));
1237: my %Row = &Process_OR_Row($row);
1238: while (my ($foilid,$href) = each(%Row)) {
1239: if (! ref($href)) {
1240: $TimeData{$foilid} += $href;
1241: next;
1242: }
1243: while (my ($option,$value) = each(%$href)) {
1244: $TimeData{$foilid}->{$option}+=$value;
1245: }
1246: }
1247: }
1248: my @plotdata;
1249: my @labels;
1250: foreach my $concept (@{$Concepts}) {
1251: foreach my $foil (@{$concept->{'foils'}}) {
1252: push(@labels,scalar(@labels)+1);
1253: my $total = $TimeData{$foil}->{'_total'};
1254: if ($total == 0) {
1255: push(@{$plotdata[0]},0);
1256: } else {
1257: push(@{$plotdata[0]},
1258: 100 * $TimeData{$foil}->{'_correct'} / $total);
1259: }
1260: my $total_incorrect = $total - $TimeData{$foil}->{'_correct'};
1261: for (my $i=0;$i<scalar(@{$ORdata->{'_Options'}});$i++) {
1262: my $option = $ORdata->{'_Options'}->[$i];
1263: if ($total_incorrect == 0) {
1264: push(@{$plotdata[$i+1]},0);
1265: } else {
1266: push(@{$plotdata[$i+1]},
1267: 100 * $TimeData{$foil}->{$option} / $total_incorrect);
1268: }
1269: }
1270: }
1271: # Put in a blank one
1272: push(@labels,'');
1273: push(@{$plotdata[0]},0);
1274: for (my $i=0;$i<scalar(@{$ORdata->{'_Options'}});$i++) {
1275: push(@{$plotdata[$i+1]},0);
1276: }
1277: }
1278: #
1279: # Create the plot
1280: my $count = $end_index-$begin_index;
1281: return ('No data','') if ($count <= 0);
1282: my $title;
1283: if ($count == 0) {
1284: $title = 'no submissions';
1285: } elsif ($count == 1) {
1286: $title = 'one submission';
1287: } elsif ($count > 1) {
1288: $title = $count.' submissions';
1289: }
1290: my $correct_plot = &Apache::loncommon::DrawBarGraph($title,
1291: 'Foil Number',
1292: 'Percent Correct',
1293: 100,
1294: $plotcolors,
1295: undef,
1296: $plotdata[0]);
1297: for (my $j=0; $j< scalar(@{$plotdata[0]});$j++) {
1298: $plotdata[0]->[$j]=0;
1299: }
1300: $count = $end_index-$begin_index-$TimeData{'_correct'};
1301: if ($count == 0) {
1302: $title = 'no submissions';
1303: } elsif ($count < 0) {
1304: return ($correct_plot,'');
1305: } elsif ($count == 1) {
1306: $title = 'one submission';
1307: } else {
1308: $title = $count.' submissions';
1309: }
1310: my $incorrect_plot = &Apache::loncommon::DrawBarGraph($title,
1311: 'Foil Number',
1312: 'Incorrect Option Choice',
1313: 100,
1314: $plotcolors,
1315: undef,
1316: @plotdata);
1317: return ($correct_plot,$incorrect_plot);
1318: }
1319:
1320: sub OR_Concept_Time_Analysis {
1321: my ($performance_data,$ORdata,$Concepts,$interval) = @_;
1322: ##
1323: ## Determine starttime, endtime, startindex, endindex
1324: my ($begin_index,$end_index) = ($interval->{'begin_index'},
1325: $interval->{'end_index'});
1326: my %TimeData;
1327: #
1328: # Compute the number getting the foils correct or incorrects
1329: for (my $j=$begin_index;$j<=$end_index;$j++) {
1330: my $row = $performance_data->[$j];
1331: next if (! defined($row));
1332: my %Row = &Process_OR_Row($row);
1333: while (my ($foilid,$href) = each(%Row)) {
1334: if (! ref($href)) {
1335: $TimeData{$foilid} += $href;
1336: next;
1337: }
1338: while (my ($option,$value) = each(%$href)) {
1339: $TimeData{$foilid}->{$option}+=$value;
1340: }
1341: }
1342: }
1343: #
1344: # Put the data in plottable form
1345: my @plotdata;
1346: foreach my $concept (@$Concepts) {
1347: my ($total,$correct);
1348: foreach my $foil (@{$concept->{'foils'}}) {
1349: $total += $TimeData{$foil}->{'_total'};
1350: $correct += $TimeData{$foil}->{'_correct'};
1351: }
1352: if ($total == 0) {
1353: push(@plotdata,0);
1354: } else {
1355: push(@plotdata,100 * $correct / $total);
1356: }
1357: }
1358: #
1359: # Create the plot
1360: my $title = ($end_index - $begin_index).' submissions';
1361: return &Apache::loncommon::DrawBarGraph($title,
1362: 'Concept Number',
1363: 'Percent Correct',
1364: 100,
1365: $plotcolors,
1366: undef,
1367: \@plotdata);
1368: }
1369:
1370: #########################################################
1371: #########################################################
1372: ##
1373: ## Excel output
1374: ##
1375: #########################################################
1376: #########################################################
1377: sub OR_excel_sheet {
1378: my ($r,$resource,$performance_data,$ORdata) = @_;
1379: my $response = '';
1380: my (undef,$Foils,$Concepts) = &build_foil_index($ORdata);
1381: #
1382: # Create excel worksheet
1383: my $filename = '/prtspool/'.
1384: $ENV{'user.name'}.'_'.$ENV{'user.domain'}.'_'.
1385: time.'_'.rand(1000000000).'.xls';
1386: my $workbook = Spreadsheet::WriteExcel->new('/home/httpd'.$filename);
1387: if (! defined($workbook)) {
1388: $r->log_error("Error creating excel spreadsheet $filename: $!");
1389: $r->print('<p>'.&mt("Unable to create new Excel file. ".
1390: "This error has been logged. ".
1391: "Please alert your LON-CAPA administrator").
1392: '</p>');
1393: return undef;
1394: }
1395: #
1396: $workbook->set_tempdir('/home/httpd/perl/tmp');
1397: my $format = &Apache::loncommon::define_excel_formats($workbook);
1398: #
1399: # Create and populate main worksheets
1400: my $problem_data_sheet = $workbook->addworksheet('Problem Data');
1401: my $student_data_sheet = &build_student_data_worksheet($workbook,$format);
1402: my $response_data_sheet = $workbook->addworksheet('Response Data');
1403: foreach my $sheet ($problem_data_sheet,$student_data_sheet,
1404: $response_data_sheet) {
1405: $sheet->write(0,0,$resource->{'title'},$format->{'h2'});
1406: $sheet->write(1,0,$resource->{'src'},$format->{'h3'});
1407: }
1408: #
1409: my $result;
1410: $result = &OR_build_problem_data_worksheet($problem_data_sheet,$format,
1411: $Concepts,$ORdata);
1412: if ($result ne 'okay') {
1413: # Do something useful
1414: }
1415: $result = &OR_build_response_data_worksheet($response_data_sheet,$format,
1416: $performance_data,$Foils,
1417: $ORdata);
1418: if ($result ne 'okay') {
1419: # Do something useful
1420: }
1421: $response_data_sheet->activate();
1422: #
1423: # Close the excel file
1424: $workbook->close();
1425: #
1426: # Write a link to allow them to download it
1427: $result .= '<h2>'.&mt('Excel Raw Data Output').'</h2>'.
1428: '<p><a href="'.$filename.'">'.
1429: &mt('Your Excel spreadsheet.').
1430: '</a></p>'."\n";
1431: return $result;
1432: }
1433:
1434: sub OR_build_problem_data_worksheet {
1435: my ($worksheet,$format,$Concepts,$ORdata) = @_;
1436: my $rows_output = 3;
1437: my $cols_output = 0;
1438: $worksheet->write($rows_output++,0,'Problem Structure',$format->{'h3'});
1439: ##
1440: ##
1441: my @Headers;
1442: if (@$Concepts > 1) {
1443: @Headers = ("Concept\nNumber",'Concept',"Foil\nNumber",
1444: 'Foil Name','Foil Text','Correct value');
1445: } else {
1446: @Headers = ('Foil Number','FoilName','Foil Text','Correct value');
1447: }
1448: $worksheet->write_row($rows_output++,0,\@Headers,$format->{'header'});
1449: my %Foildata = %{$ORdata->{'_Foils'}};
1450: my $conceptindex = 1;
1451: my $foilindex = 1;
1452: foreach my $concept (@$Concepts) {
1453: my @FoilsInConcept = @{$concept->{'foils'}};
1454: my $firstfoil = shift(@FoilsInConcept);
1455: if (@$Concepts > 1) {
1456: $worksheet->write_row($rows_output++,0,
1457: [$conceptindex,
1458: $concept->{'name'},
1459: $foilindex++,
1460: $Foildata{$firstfoil}->{'name'},
1461: $Foildata{$firstfoil}->{'text'},
1462: $Foildata{$firstfoil}->{'value'},]);
1463: } else {
1464: $worksheet->write_row($rows_output++,0,
1465: [ $foilindex++,
1466: $Foildata{$firstfoil}->{'name'},
1467: $Foildata{$firstfoil}->{'text'},
1468: $Foildata{$firstfoil}->{'value'},]);
1469: }
1470: foreach my $foilid (@FoilsInConcept) {
1471: if (@$Concepts > 1) {
1472: $worksheet->write_row($rows_output++,0,
1473: ['',
1474: '',
1475: $foilindex,
1476: $Foildata{$foilid}->{'name'},
1477: $Foildata{$foilid}->{'text'},
1478: $Foildata{$foilid}->{'value'},]);
1479: } else {
1480: $worksheet->write_row($rows_output++,0,
1481: [$foilindex,
1482: $Foildata{$foilid}->{'name'},
1483: $Foildata{$foilid}->{'text'},
1484: $Foildata{$foilid}->{'value'},]);
1485: }
1486: } continue {
1487: $foilindex++;
1488: }
1489: } continue {
1490: $conceptindex++;
1491: }
1492: $rows_output++;
1493: $rows_output++;
1494: ##
1495: ## Option data output
1496: $worksheet->write($rows_output++,0,'Options',$format->{'header'});
1497: foreach my $string (@{$ORdata->{'_Options'}}) {
1498: $worksheet->write($rows_output++,0,$string);
1499: }
1500: return 'okay';
1501: }
1502:
1503: sub OR_build_response_data_worksheet {
1504: my ($worksheet,$format,$performance_data,$Foils,$ORdata)=@_;
1505: my $rows_output = 3;
1506: my $cols_output = 0;
1507: $worksheet->write($rows_output++,0,'Response Data',$format->{'h3'});
1508: $worksheet->set_column(1,1,20);
1509: $worksheet->set_column(2,2,13);
1510: my @Headers = ('identifier','time','award detail','attempt');
1511: foreach my $foil (@$Foils) {
1512: push (@Headers,$foil.' submission');
1513: push (@Headers,$foil.' grading');
1514: }
1515: $worksheet->write_row($rows_output++,0,\@Headers,$format->{'header'});
1516: #
1517: foreach my $row (@$performance_data) {
1518: next if (! defined($row));
1519: my ($student,$award,$grading,$submission,$time,$tries) = @$row;
1520: my @Foilgrades = split('&',$grading);
1521: my @Foilsubs = split('&',$submission);
1522: my %response_data;
1523: for (my $j=0;$j<=$#Foilgrades;$j++) {
1524: my ($foilid,$correct) = split('=',$Foilgrades[$j]);
1525: my (undef,$submission) = split('=',$Foilsubs[$j]);
1526: $submission = &Apache::lonnet::unescape($submission);
1527: $response_data{$foilid.' submission'}=$submission;
1528: $response_data{$foilid.' award'}=$correct;
1529: }
1530: $worksheet->write($rows_output,$cols_output++,$student);
1531: $worksheet->write($rows_output,$cols_output++,
1532: &Apache::lonstathelpers::calc_serial($time),$format->{'date'});
1533: $worksheet->write($rows_output,$cols_output++,$award);
1534: $worksheet->write($rows_output,$cols_output++,$tries);
1535: foreach my $foilid (@$Foils) {
1536: $worksheet->write($rows_output,$cols_output++,
1537: $response_data{$foilid.' submission'});
1538: $worksheet->write($rows_output,$cols_output++,
1539: $response_data{$foilid.' award'});
1540: }
1541: $rows_output++;
1542: $cols_output = 0;
1543: }
1544: return;
1545: }
1546:
1547: sub build_foil_index {
1548: my ($ORdata) = @_;
1549: return if (! exists($ORdata->{'_Foils'}));
1550: my %Foildata = %{$ORdata->{'_Foils'}};
1551: my @Foils = sort(keys(%Foildata));
1552: my %Concepts;
1553: foreach my $foilid (@Foils) {
1554: push(@{$Concepts{$Foildata{$foilid}->{'_Concept'}}},
1555: $foilid);
1556: }
1557: undef(@Foils);
1558: # Having gathered the concept information in a hash, we now translate it
1559: # into an array because we need to be consistent about order.
1560: # Also put the foils in order, too.
1561: my $sortfunction = sub {
1562: my %Numbers = (one => 1,
1563: two => 2,
1564: three => 3,
1565: four => 4,
1566: five => 5,
1567: six => 6,
1568: seven => 7,
1569: eight => 8,
1570: nine => 9,
1571: ten => 10,);
1572: my $a1 = lc($a);
1573: my $b1 = lc($b);
1574: if (exists($Numbers{$a1})) {
1575: $a1 = $Numbers{$a1};
1576: }
1577: if (exists($Numbers{$b1})) {
1578: $b1 = $Numbers{$b1};
1579: }
1580: if (($a1 =~/^\d+$/) && ($b1 =~/^\d+$/)) {
1581: return $a1 <=> $b1;
1582: } else {
1583: return $a1 cmp $b1;
1584: }
1585: };
1586: my @Concepts;
1587: foreach my $concept (sort $sortfunction (keys(%Concepts))) {
1588: if (! defined($Concepts{$concept})) {
1589: $Concepts{$concept}=[];
1590: # next;
1591: }
1592: push(@Concepts,{ name => $concept,
1593: foils => [@{$Concepts{$concept}}]});
1594: push(@Foils,(@{$Concepts{$concept}}));
1595: }
1596: #
1597: # Build up the table of row labels.
1598: my $table = '<table border="1" >'."\n";
1599: if (@Concepts > 1) {
1600: $table .= '<tr>'.
1601: '<th>'.&mt('Concept Number').'</th>'.
1602: '<th>'.&mt('Concept').'</th>'.
1603: '<th>'.&mt('Foil Number').'</th>'.
1604: '<th>'.&mt('Foil Name').'</th>'.
1605: '<th>'.&mt('Foil Text').'</th>'.
1606: '<th>'.&mt('Correct Value').'</th>'.
1607: "</tr>\n";
1608: } else {
1609: $table .= '<tr>'.
1610: '<th>'.&mt('Foil Number').'</th>'.
1611: '<th>'.&mt('Foil Name').'</th>'.
1612: '<th>'.&mt('Foil Text').'</th>'.
1613: '<th>'.&mt('Correct Value').'</th>'.
1614: "</tr>\n";
1615: }
1616: my $conceptindex = 1;
1617: my $foilindex = 1;
1618: foreach my $concept (@Concepts) {
1619: my @FoilsInConcept = @{$concept->{'foils'}};
1620: my $firstfoil = shift(@FoilsInConcept);
1621: if (@Concepts > 1) {
1622: $table .= '<tr>'.
1623: '<td>'.$conceptindex.'</td>'.
1624: '<td>'.&HTML::Entities::encode($concept->{'name'},'<>&"').'</td>'.
1625: '<td>'.$foilindex++.'</td>'.
1626: '<td>'.&HTML::Entities::encode($Foildata{$firstfoil}->{'name'},'<>&"').'</td>'.
1627: '<td>'.$Foildata{$firstfoil}->{'text'}.'</td>'.
1628: '<td>'.&HTML::Entities::encode($Foildata{$firstfoil}->{'value'},'<>&"').'</td>'.
1629: "</tr>\n";
1630: } else {
1631: $table .= '<tr>'.
1632: '<td>'.$foilindex++.'</td>'.
1633: '<td>'.&HTML::Entities::encode($Foildata{$firstfoil}->{'name'},'<>&"').'</td>'.
1634: '<td>'.$Foildata{$firstfoil}->{'text'}.'</td>'.
1635: '<td>'.&HTML::Entities::encode($Foildata{$firstfoil}->{'value'},'<>&"').'</td>'.
1636: "</tr>\n";
1637: }
1638: foreach my $foilid (@FoilsInConcept) {
1639: if (@Concepts > 1) {
1640: $table .= '<tr>'.
1641: '<td></td>'.
1642: '<td></td>'.
1643: '<td>'.$foilindex.'</td>'.
1644: '<td>'.&HTML::Entities::encode($Foildata{$foilid}->{'name'},'<>&"').'</td>'.
1645: '<td>'.$Foildata{$foilid}->{'text'}.'</td>'.
1646: '<td>'.&HTML::Entities::encode($Foildata{$foilid}->{'value'},'<>&"').'</td>'.
1647: "</tr>\n";
1648: } else {
1649: $table .= '<tr>'.
1650: '<td>'.$foilindex.'</td>'.
1651: '<td>'.&HTML::Entities::encode($Foildata{$foilid}->{'name'},'<>&"').'</td>'.
1652: '<td>'.$Foildata{$foilid}->{'text'}.'</td>'.
1653: '<td>'.&HTML::Entities::encode($Foildata{$foilid}->{'value'},'<>&"').'</td>'.
1654: "</tr>\n";
1655: }
1656: } continue {
1657: $foilindex++;
1658: }
1659: } continue {
1660: $conceptindex++;
1661: }
1662: $table .= "</table>\n";
1663: #
1664: # Build option index with color stuff
1665: return ($table,\@Foils,\@Concepts);
1666: }
1667:
1668: sub build_option_index {
1669: my ($ORdata)= @_;
1670: my $table = "<table>\n";
1671: my $optionindex = 0;
1672: my @Rows;
1673: foreach my $option (&mt('correct option chosen'),@{$ORdata->{'_Options'}}) {
1674: push (@Rows,
1675: '<tr>'.
1676: '<td bgcolor="'.$plotcolors->[$optionindex++].'">'.
1677: (' 'x4).'</td>'.
1678: '<td>'.&HTML::Entities::encode($option,'<>&"').'</td>'.
1679: "</tr>\n");
1680: }
1681: shift(@Rows); # Throw away 'correct option chosen' color
1682: $table .= join('',reverse(@Rows));
1683: $table .= "</table>\n";
1684: }
1685:
1686: sub build_foil_key {
1687: my ($foils,$extra_data)= @_;
1688: if (! defined($extra_data)) { $extra_data = {}; }
1689: my $table = "<table>\n";
1690: my $foil_index = 0;
1691: my @rows;
1692: foreach my $foil (&mt('correct foil chosen'),@{$foils}) {
1693: push (@rows,
1694: '<tr>'.
1695: '<td bgcolor="'.$plotcolors->[$foil_index++].'">'.
1696: (' 'x4).'</td>'.
1697: '<td>'.&HTML::Entities::encode($foil,'<>&"').
1698: (' 'x2).$extra_data->{$foil}.'</td>'.
1699: "</tr>\n");
1700: }
1701: shift(@rows); # Throw away 'correct foil chosen' color
1702: $table .= join('',reverse(@rows));
1703: $table .= "</table>\n";
1704: }
1705:
1706: #########################################################
1707: #########################################################
1708: ##
1709: ## Generic Interface Routines
1710: ##
1711: #########################################################
1712: #########################################################
1713: sub CreateInterface {
1714: ##
1715: ## Environment variable initialization
1716: if (! exists$ENV{'form.AnalyzeOver'}) {
1717: $ENV{'form.AnalyzeOver'} = 'tries';
1718: }
1719: ##
1720: ## Build the menu
1721: my $Str = '';
1722: $Str .= &Apache::lonhtmlcommon::breadcrumbs
1723: (undef,'Detailed Problem Analysis');
1724: $Str .= '<table cellspacing="5">'."\n";
1725: $Str .= '<tr>';
1726: $Str .= '<td align="center"><b>'.&mt('Sections').'</b></td>';
1727: $Str .= '<td align="center"><b>'.&mt('Enrollment Status').'</b></td>';
1728: # $Str .= '<td align="center"><b>'.&mt('Sequences and Folders').'</b></td>';
1729: $Str .= '<td align="center"> </td>';
1730: $Str .= '</tr>'."\n";
1731: ##
1732: ##
1733: $Str .= '<tr><td align="center">'."\n";
1734: $Str .= &Apache::lonstatistics::SectionSelect('Section','multiple',5);
1735: $Str .= '</td>';
1736: #
1737: $Str .= '<td align="center">';
1738: $Str .= &Apache::lonhtmlcommon::StatusOptions(undef,undef,5);
1739: $Str .= '</td>';
1740: #
1741: # $Str .= '<td align="center">';
1742: my $only_seq_with_assessments = sub {
1743: my $s=shift;
1744: if ($s->{'num_assess'} < 1) {
1745: return 0;
1746: } else {
1747: return 1;
1748: }
1749: };
1750: &Apache::lonstatistics::MapSelect('Maps','multiple,all',5,
1751: $only_seq_with_assessments);
1752: ##
1753: ##
1754: $Str .= '<td>';
1755: ##
1756: my $showprob_checkbox =
1757: '<input type="checkbox" name="show_prob" value="true" ';
1758: if ($ENV{'form.show_prob'} eq 'true') {
1759: $showprob_checkbox .= 'checked ';
1760: }
1761: $showprob_checkbox.= ' />';
1762: $Str.= '<nobr><label>'.
1763: &mt('Show problem [_1]',$showprob_checkbox).
1764: '</label></nobr><br />';
1765: ##
1766: my $analyze_selector = '<select name="AnalyzeOver" >';
1767: $analyze_selector .= '<option value="tries" ';
1768: if (! exists($ENV{'form.AnalyzeOver'}) ||
1769: $ENV{'form.AnalyzeOver'} eq 'tries'){
1770: # Default to tries
1771: $analyze_selector .= ' selected ';
1772: }
1773: $analyze_selector .= '>'.&mt('Tries').'</option>';
1774: $analyze_selector .= '<option value="time" ';
1775: $analyze_selector .= ' selected ' if ($ENV{'form.AnalyzeOver'} eq 'time');
1776: $analyze_selector .= '>'.&mt('Time').'</option>';
1777: $analyze_selector .= '</select>';
1778: $Str .= '<nobr><label>'.
1779: &mt('Analyze Over [_1] [_2]',
1780: $analyze_selector,
1781: &Apache::loncommon::help_open_topic('Analysis_Analyze_Over')).
1782: '</label></nobr><br />'.$/;
1783: ##
1784: my $numplots_selector = '<select name="NumPlots">';
1785: if (! exists($ENV{'form.NumPlots'})
1786: || $ENV{'form.NumPlots'} < 1
1787: || $ENV{'form.NumPlots'} > 20) {
1788: $ENV{'form.NumPlots'} = 5;
1789: }
1790: foreach my $i (1,2,3,4,5,6,7,8,10,15,20) {
1791: $numplots_selector .= '<option value="'.$i.'" ';
1792: if ($ENV{'form.NumPlots'} == $i) { $numplots_selector.=' selected '; }
1793: $numplots_selector .= '>'.$i.'</option>';
1794: }
1795: $numplots_selector .= '</select></nobr><br />';
1796: $Str .= '<nobr><label>'.&mt('Number of Plots [_1]',$numplots_selector).
1797: '</label></nobr>';
1798: ##
1799: $Str .= '<nobr><label>'.&mt('Status: [_1]',
1800: '<input type="text" '.
1801: 'name="stats_status" size="60" value="" />'
1802: ).
1803: '</label></nobr>';
1804: $Str .= '</td>';
1805: ##
1806: ##
1807: $Str .= '</tr>'."\n";
1808: $Str .= '</table>'."\n";
1809: return $Str;
1810: }
1811:
1812: #########################################################
1813: #########################################################
1814: ##
1815: ## Misc Option Response functions
1816: ##
1817: #########################################################
1818: #########################################################
1819: sub get_time_from_row {
1820: my ($row) = @_;
1821: if (ref($row)) {
1822: return $row->[&Apache::loncoursedata::RD_timestamp()];
1823: }
1824: return undef;
1825: }
1826:
1827: sub get_tries_from_row {
1828: my ($row) = @_;
1829: if (ref($row)) {
1830: return $row->[&Apache::loncoursedata::RD_tries()];
1831: }
1832: return undef;
1833: }
1834:
1835: sub hashify_attempt {
1836: my ($row) = @_;
1837: my %attempt;
1838: $attempt{'student'} = $row->[&Apache::loncoursedata::RD_sname()];
1839: $attempt{'tries'} = $row->[&Apache::loncoursedata::RD_tries()];
1840: $attempt{'submission'} = &Apache::lonnet::unescape($row->[&Apache::loncoursedata::RD_submission()]);
1841: $attempt{'award'} = $row->[&Apache::loncoursedata::RD_awarddetail()];
1842: $attempt{'timestamp'} = $row->[&Apache::loncoursedata::RD_timestamp()];
1843: return %attempt;
1844: }
1845:
1846: sub Process_OR_Row {
1847: my ($row) = @_;
1848: my %RowData;
1849: my $student_id = $row->[&Apache::loncoursedata::RD_student_id()];
1850: my $award = $row->[&Apache::loncoursedata::RD_awarddetail()];
1851: my $grading = $row->[&Apache::loncoursedata::RD_response_eval()];
1852: my $submission = $row->[&Apache::loncoursedata::RD_submission()];
1853: my $time = $row->[&Apache::loncoursedata::RD_timestamp()];
1854: my $tries = $row->[&Apache::loncoursedata::RD_tries()];
1855: return undef if ($award eq 'MISSING_ANSWER');
1856: if ($award =~ /(APPROX_ANS|EXACT_ANS)/) {
1857: $RowData{'_correct'} = 1;
1858: }
1859: $RowData{'_total'} = 1;
1860: my @Foilgrades = split('&',$grading);
1861: my @Foilsubs = split('&',$submission);
1862: for (my $j=0;$j<=$#Foilgrades;$j++) {
1863: my ($foilid,$correct) = split('=',$Foilgrades[$j]);
1864: $foilid = &Apache::lonnet::unescape($foilid);
1865: my (undef,$submission) = split('=',$Foilsubs[$j]);
1866: if ($correct) {
1867: $RowData{$foilid}->{'_correct'}++;
1868: } else {
1869: $submission = &Apache::lonnet::unescape($submission);
1870: $RowData{$foilid}->{$submission}++;
1871: }
1872: $RowData{$foilid}->{'_total'}++;
1873: }
1874: return %RowData;
1875: }
1876:
1877: 1;
1878:
1879: __END__
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