Annotation of loncom/homework/default_homework.lcpm, revision 1.132
1.42 albertel 1: # The LearningOnline Network with CAPA
1.1 harris41 2: # used by lonxml::xmlparse() as input variable $safeinit to Apache::run::run()
1.42 albertel 3: #
1.132 ! www 4: # $Id: default_homework.lcpm,v 1.131 2008/03/06 02:20:05 www Exp $
1.42 albertel 5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
1.20 harris41 28: #
1.76 albertel 29:
1.25 albertel 30: #init some globals
1.38 albertel 31: $hidden::RANDOMINIT=0;
1.22 ng 32: $pi=atan2(1,1)*4;
33: $rad2deg=180.0/$pi;
34: $deg2rad=$pi/180.0;
1.44 matthew 35: $"=' ';
1.116 albertel 36: use strict;
37: {
38: my $n = 0;
39: my $total = 0;
40: my $num_left = 0;
41: my @order;
42: my $type;
43:
44: sub init_permutation {
45: my ($size,$requested_type) = @_;
46: @order = (0..$size-1);
47: $n = $size;
48: $type = $requested_type;
49: if ($type eq 'ordered') {
50: $total = $num_left = 1;
51: } elsif ($type eq 'unordered') {
52: $total = $num_left = &factorial($size);
53: } else {
54: die("Unkown type: $type");
55: }
56: }
57:
58: sub get_next_permutation {
59: if ($num_left == $total) {
60: $num_left--;
1.117 albertel 61: return \@order;
1.116 albertel 62: }
63:
64: # Find largest index j with a[j] < a[j+1]
65:
66: my $j = scalar(@order) - 2;
67: while ($order[$j] > $order[$j+1]) {
68: $j--;
69: }
70:
71: # Find index k such that a[k] is smallest integer
72: # greater than a[j] to the right of a[j]
73:
74: my $k = scalar(@order) - 1;
75: while ($order[$j] > $order[$k]) {
76: $k--;
77: }
78:
79: # Interchange a[j] and a[k]
80:
81: @order[($k,$j)] = @order[($j,$k)];
82:
83: # Put tail end of permutation after jth position in increasing order
84:
85: my $r = scalar(@order) - 1;
86: my $s = $j + 1;
87:
88: while ($r > $s) {
89: @order[($s,$r)]=@order[($r,$s)];
90: $r--;
91: $s++;
92: }
93:
94: $num_left--;
1.117 albertel 95: return(\@order);
1.116 albertel 96: }
97:
98: sub get_permutations_left {
99: return $num_left;
100: }
101: }
1.3 albertel 102:
1.91 albertel 103: sub check_commas {
104: my ($response)=@_;
105: #print("$response ");
106: my @numbers=split(',',$response);
107: #print(" numbers ".join('-',@numbers)." ");
108: if (scalar(@numbers) > 1) {
109: #print(" numbers[0] ".$numbers[0]." ");
110: if (length($numbers[0]) > 3 || length($numbers[0]) == 0) { return -1; }
111: shift(@numbers);
112: #print(" numbers ".scalar(@numbers)." ");
113: while (scalar(@numbers) > 1) {
114: #print(" numbers ".join('-',@numbers)." ");
115: if (length($numbers[0]) != 3) { return -2; }
116: shift(@numbers);
117: }
118: my ($number)=split('\.',$numbers[0]);
119: #print(" number ".$number." ");
120: #print(" numbers[0] ".$numbers[0]." ");
121: if (length($number) != 3) { return -3; }
122: } else {
123: my ($number)=split('\.',$numbers[0]);
124: if (length($number) > 3) { return -4; }
125: }
126: return 1;
127: }
128:
1.117 albertel 129:
1.7 albertel 130: sub caparesponse_check {
1.74 albertel 131: my ($answer,$response)=@_;
1.73 albertel 132: #not properly used yet: calc
133: #not to be used: $ans_fmt
1.74 albertel 134: my $type=$LONCAPA::CAPAresponse_args{'type'};
135: my $tol=$LONCAPA::CAPAresponse_args{'tol'};
136: my $sig=$LONCAPA::CAPAresponse_args{'sig'};
1.88 albertel 137: my $ans_fmt=$LONCAPA::CAPAresponse_args{'format'};
1.74 albertel 138: my $unit=$LONCAPA::CAPAresponse_args{'unit'};
139: my $calc=$LONCAPA::CAPAresponse_args{'calc'};
140: my $samples=$LONCAPA::CAPAresponse_args{'samples'};
1.73 albertel 141:
142: my $tol_type=''; # gets it's value from whether tol has a % or not done
143: my $sig_lbound=''; #done
144: my $sig_ubound=''; #done
145:
146:
147: #type's definitons come from capaParser.h
1.116 albertel 148:
1.73 albertel 149: #remove leading and trailing whitespace
150: if (!defined($response)) {
151: $response='';
152: }
153: if ($response=~ /^\s|\s$/) {
154: $response=~ s:^\s+|\s+$::g;
1.119 albertel 155: &LONCAPA_INTERNAL_DEBUG("Removed ws now :$response:");
1.73 albertel 156: }
1.116 albertel 157:
1.117 albertel 158: #&LONCAPA_INTERNAL_DEBUG(" type is $type ");
1.100 albertel 159: if ($type eq 'cs' || $type eq 'ci') {
1.130 www 160: #for string answers make sure all places spaces occur, there is
1.76 albertel 161: #really only 1 space, in both the answer and the response
162: $answer=~s/ +/ /g;
163: $response=~s/ +/ /g;
1.100 albertel 164: } elsif ($type eq 'mc') {
165: $answer=~s/[\s,]//g;
166: $response=~s/[\s,]//g;
1.76 albertel 167: }
1.91 albertel 168: if ($type eq 'float' && $unit=~/\$/) {
1.126 www 169: if ($response!~/^\$|\$$/) { return ('NO_UNIT', undef); }
1.88 albertel 170: $response=~s/\$//g;
171: }
1.91 albertel 172: if ($type eq 'float' && $unit=~/\,/ && (&check_commas($response)<0)) {
173: return "COMMA_FAIL:";
174: }
1.88 albertel 175: $ans_fmt=~s/\W//g;
1.91 albertel 176: $unit=~s/[\$,]//g;
177: if ($type eq 'float') { $response=~s/,//g; }
1.88 albertel 178:
1.117 albertel 179: if (length($response) > 500) { return ('TOO_LONG',undef); }
1.73 albertel 180:
181: if ($type eq '' ) {
1.119 albertel 182: &LONCAPA_INTERNAL_DEBUG("Didn't find a type :$type: defaulting");
1.73 albertel 183: if ( $answer eq ($answer *1.0)) { $type = 2;
184: } else { $type = 3; }
185: } else {
1.107 albertel 186: if ($type eq 'cs') { $type = 4; }
1.73 albertel 187: elsif ($type eq 'ci') { $type = 3 }
188: elsif ($type eq 'mc') { $type = 5; }
189: elsif ($type eq 'fml') { $type = 8; }
1.107 albertel 190: elsif ($type eq 'math') { $type = 9; }
1.73 albertel 191: elsif ($type eq 'subj') { $type = 7; }
192: elsif ($type eq 'float') { $type = 2; }
193: elsif ($type eq 'int') { $type = 1; }
1.117 albertel 194: else { return ('ERROR', "Unknown type of answer: $type") }
1.73 albertel 195: }
196:
197: my $points;
198: my $id_list;
199: #formula type setup the sample points
200: if ($type eq '8') {
201: ($id_list,$points)=split(/@/,$samples);
1.119 albertel 202: &LONCAPA_INTERNAL_DEBUG("Found :$id_list:$points: points in $samples");
1.73 albertel 203: }
204: if ($tol eq '') {
205: $tol=0.0;
206: $tol_type=1; #TOL_ABSOLUTE
207: } else {
208: if ($tol =~ /%$/) {
209: chop $tol;
210: $tol_type=2; #TOL_PERCENTAGE
211: } else {
212: $tol_type=1; #TOL_ABSOLUTE
213: }
214: }
215:
1.85 albertel 216: ($sig_ubound,$sig_lbound)=&LONCAPA_INTERNAL_get_sigrange($sig);
217:
1.73 albertel 218: my $reterror="";
1.107 albertel 219: my $result;
1.125 www 220: if ((($type eq '9') || ($type eq '8')) && ($response=~/\=/)) { return ('BAD_FORMULA','Please submit just an expression, not an equation.'); }
1.107 albertel 221: if ($type eq '9') {
1.108 www 222: $result = &maxima_check(&maxima_cas_formula_fix($response),&maxima_cas_formula_fix($answer),\$reterror);
1.107 albertel 223: } else {
1.109 albertel 224: if ($type eq '8') { # fml type
225: $response = &capa_formula_fix($response);
226: $answer = &capa_formula_fix($answer);
227: }
228: $result = &caparesponse_capa_check_answer($response,$answer,$type,
1.73 albertel 229: $tol_type,$tol,
230: $sig_lbound,$sig_ubound,
231: $ans_fmt,$unit,$calc,$id_list,
232: $points,$external::randomseed,
233: \$reterror);
1.107 albertel 234: }
1.73 albertel 235: if ($result == '1') { $result='EXACT_ANS'; }
236: elsif ($result == '2') { $result='APPROX_ANS'; }
237: elsif ($result == '3') { $result='SIG_FAIL'; }
238: elsif ($result == '4') { $result='UNIT_FAIL'; }
239: elsif ($result == '5') { $result='NO_UNIT'; }
240: elsif ($result == '6') { $result='UNIT_OK'; }
241: elsif ($result == '7') { $result='INCORRECT'; }
242: elsif ($result == '8') { $result='UNIT_NOTNEEDED'; }
243: elsif ($result == '9') { $result='ANS_CNT_NOT_MATCH'; }
244: elsif ($result =='10') { $result='SUB_RECORDED'; }
245: elsif ($result =='11') { $result='BAD_FORMULA'; }
1.94 albertel 246: elsif ($result =='12' && !$response) { $result='MISSING_ANSWER'; }
247: elsif ($result =='12') { $result='WANTED_NUMERIC'; }
1.77 albertel 248: elsif ($result =='13') { $result='UNIT_INVALID_INSTRUCTOR'; }
249: elsif ($result =='141') { $result='UNIT_INVALID_STUDENT'; }
250: elsif ($result =='142') { $result='UNIT_INVALID_STUDENT'; }
251: elsif ($result =='143') { $result='UNIT_INVALID_STUDENT'; }
252: elsif ($result =='15') { $result='UNIT_IRRECONCIBLE'; }
1.73 albertel 253: else {$result = "ERROR: Unknown Result:$result:$@:";}
254:
1.119 albertel 255: &LONCAPA_INTERNAL_DEBUG("RetError $reterror: Answer $answer: Response $response: type-$type|$tol|$tol_type|$sig:$sig_lbound:$sig_ubound|$unit|");
256: &LONCAPA_INTERNAL_DEBUG(" $answer $response $result ");
1.116 albertel 257: return ($result,$reterror)
1.37 albertel 258: }
259:
1.73 albertel 260:
1.37 albertel 261: sub caparesponse_check_list {
1.119 albertel 262: my $responses=$LONCAPA::CAPAresponse_args{'response'};
1.121 albertel 263: # &LONCAPA_INTERNAL_DEBUG(" answer is ".
264: # &LONCAPA_INTERNAL_Dumper($LONCAPA::CAPAresponse_answer).":\n");
265: # &LONCAPA_INTERNAL_DEBUG(" respons is ".
266: # &LONCAPA_INTERNAL_Dumper($responses).":\n");
1.105 albertel 267: &LONCAPA_INTERNAL_DEBUG("args ".join(':',%LONCAPA::CAPAresponse_args));
1.74 albertel 268: my $type = $LONCAPA::CAPAresponse_args{'type'};
1.116 albertel 269: &LONCAPA_INTERNAL_DEBUG("Got type :$type:\n");
1.119 albertel 270:
271: my $num_input_lines =
272: scalar(@{$LONCAPA::CAPAresponse_answer->{'answers'}});
1.120 albertel 273:
274: if ($type ne '' ) {
1.119 albertel 275: if (scalar(@$responses) < $num_input_lines) {
1.105 albertel 276: return 'MISSING_ANSWER';
277: }
1.119 albertel 278: if (scalar(@$responses) > $num_input_lines) {
279: return 'EXTRA_ANSWER';
280: }
281:
282: }
283:
284: foreach my $which (0..($num_input_lines-1)) {
285: my $answer_size =
286: scalar(@{$LONCAPA::CAPAresponse_answer->{'answers'}[$which]});
287: if ($type ne ''
288: && $answer_size > 1) {
289: $responses->[$which]=[split(/,/,$responses->[$which])];
290: } else {
291: $responses->[$which]=[$responses->[$which]];
292: }
293: }
1.121 albertel 294: # &LONCAPA_INTERNAL_DEBUG(" parsed response is ".
295: # &LONCAPA_INTERNAL_Dumper($responses).":\n");
1.119 albertel 296: foreach my $which (0..($num_input_lines-1)) {
297: my $answer_size =
298: scalar(@{$LONCAPA::CAPAresponse_answer->{'answers'}[$which]});
299: my $response_size =
300: scalar(@{$responses->[$which]});
301: if ($answer_size > $response_size) {
302: return 'MISSING_ANSWER';
303: }
304: if ($answer_size < $response_size) {
1.105 albertel 305: return 'EXTRA_ANSWER';
306: }
1.73 albertel 307: }
1.119 albertel 308:
309: &LONCAPA_INTERNAL_DEBUG("Initial final response :$responses->[0][-1]:");
1.105 albertel 310: my $unit;
1.73 albertel 311: if ($type eq '' || $type eq 'float') {
312: #for numerical problems split off the unit
1.128 www 313: # if ( $responses->[0][-1]=~ /(.*[^\s])\s+([^\s]+)/ ) {
1.132 ! www 314: if ( $responses->[0][-1]=~ /^([\d\.\,\s\$]*(?:(?:[xX\*]10[\^\*]*|[eE]*)[\+\-]*\d*)*(?:^|\S)\d+)([\$\s\w\^\*\/\(\)\+\-]*[^\d\.\s\,][\$\s\w\^\*\/\(\)\+\-]*)$/ ) {
1.119 albertel 315: $responses->[0][-1]=$1;
1.128 www 316: $unit=&capa_formula_fix($2);
317: &LONCAPA_INTERNAL_DEBUG("Found unit :$unit:");
1.73 albertel 318: }
319: }
1.119 albertel 320: &LONCAPA_INTERNAL_DEBUG("Final final response :$responses->[0][-1]:$unit:");
1.73 albertel 321: $unit=~s/\s//;
1.119 albertel 322: if ($unit ne '') {
323: foreach my $response (@$responses) {
1.127 www 324: foreach my $element (@$response) {
1.132 ! www 325: $element =~ s/\s//g;
! 326: my $appendunit=$unit;
! 327: if ($unit=~/\%/) {
! 328: $element=$element/100;
! 329: $appendunit=~s/\%//;
! 330: }
! 331: $element .= " $appendunit";
! 332: &LONCAPA_INTERNAL_DEBUG("Made response element :$element:");
1.119 albertel 333: }
334: }
335: }
336:
1.117 albertel 337: foreach my $thisanswer (@{ $LONCAPA::CAPAresponse_answer->{'answers'} }) {
338: if (!defined($thisanswer)) {
339: return ('ERROR','answer was undefined');
340: }
341: }
342:
343:
1.121 albertel 344: # &LONCAPA_INTERNAL_DEBUG(&LONCAPA_INTERNAL_Dumper($responses));
1.117 albertel 345: my %memoized;
346: if ($LONCAPA::CAPAresponse_answer->{'type'} eq 'ordered') {
1.119 albertel 347: for (my $i=0; $i<scalar(@$responses);$i++) {
1.117 albertel 348: my $answer = $LONCAPA::CAPAresponse_answer->{'answers'}[$i];
1.119 albertel 349: my $response = $responses->[$i];
1.117 albertel 350: my $key = "$answer\0$response";
1.119 albertel 351: my (@awards,@msgs);
352: for (my $j=0; $j<scalar(@$response); $j++) {
353: my ($award,$msg) = &caparesponse_check($answer->[$j],
354: $response->[$j]);
355: push(@awards,$award);
356: push(@msgs, $msg);
357: }
358: my ($award,$msg) =
359: &LONCAPA_INTERNAL_FINALIZEAWARDS(\@awards,\@msgs);
360: $memoized{$key} = [$award,$msg];
1.117 albertel 361: }
362: } else {
1.119 albertel 363: #FIXME broken with unorder responses where one is a <value>
364: # and the other is a <vector> (need to delay parse til
365: # inside the loop?)
366: foreach my $response (@$responses) {
367: my $response_size = scalar(@{$response});
1.117 albertel 368: foreach my $answer (@{ $LONCAPA::CAPAresponse_answer->{'answers'} }) {
369: my $key = "$answer\0$response";
1.119 albertel 370: my $answer_size = scalar(@{$answer});
371: my ($award,$msg);
372: if ($answer_size > $response_size) {
373: $award = 'MISSING_ANSWER';
374: } elsif ($answer_size < $response_size) {
375: $award = 'EXTRA_ANSWER';
376: } else {
377: my (@awards,@msgs);
378: for (my $j=0; $j<scalar(@$response); $j++) {
379: my ($award,$msg) = &caparesponse_check($answer->[$j],
380: $response->[$j]);
381: push(@awards,$award);
382: push(@msgs, $msg);
383: }
384: ($award,$msg) =
385: &LONCAPA_INTERNAL_FINALIZEAWARDS(\@awards,\@msgs);
386: }
387: $memoized{$key} = [$award,$msg];
1.117 albertel 388: }
389: }
390: }
391:
1.116 albertel 392: my ($final_award,$final_msg);
1.119 albertel 393: &init_permutation(scalar(@$responses),
1.116 albertel 394: $LONCAPA::CAPAresponse_answer->{'type'});
1.117 albertel 395:
1.118 albertel 396: # possible FIXMEs
397: # - significant time is spent calling non-safe space routine
398: # from safe space
399: # - early outs could be possible with classifying awards is to stratas
400: # and stopping as so as hitting the top strata
401: # - some early outs also might be possible with check ing the
402: # memoized hash of results (is correct even possible? etc.)
403:
1.117 albertel 404: my (@final_awards,@final_msg);
1.116 albertel 405: while( &get_permutations_left() ) {
1.117 albertel 406: my $order = &get_next_permutation();
1.116 albertel 407: my (@awards, @msgs, $i);
408: foreach my $thisanswer (@{ $LONCAPA::CAPAresponse_answer->{'answers'} }) {
1.119 albertel 409: my $key = "$thisanswer\0".$responses->[$order->[$i]];
1.117 albertel 410: push(@awards,$memoized{$key}[0]);
411: push(@msgs,$memoized{$key}[1]);
1.116 albertel 412: $i++;
1.119 albertel 413:
1.116 albertel 414: }
1.119 albertel 415: &LONCAPA_INTERNAL_DEBUG(" all awards ".join(':',@awards));
416:
1.116 albertel 417: my ($possible_award,$possible_msg) =
418: &LONCAPA_INTERNAL_FINALIZEAWARDS(\@awards,\@msgs);
1.119 albertel 419: &LONCAPA_INTERNAL_DEBUG(" pos awards ".$possible_award);
1.117 albertel 420: push(@final_awards,$possible_award);
421: push(@final_msg,$possible_msg);
1.73 albertel 422: }
1.117 albertel 423:
1.119 albertel 424: &LONCAPA_INTERNAL_DEBUG(" all final_awards ".join(':',@final_awards));
1.117 albertel 425: my ($final_award,$final_msg) =
426: &LONCAPA_INTERNAL_FINALIZEAWARDS(\@final_awards,\@final_msg,undef,1);
1.116 albertel 427: return ($final_award,$final_msg);
1.7 albertel 428: }
429:
1.124 www 430: sub cas {
431: my ($system,$input)=@_;
432: my $output;
433: if ($system eq 'maxima') {
434: $output=&maxima_eval($input);
435: }
436: return $output;
437: }
438:
1.4 albertel 439: sub tex {
1.73 albertel 440: if ( $external::target eq "tex" ) {
441: return $_[0];
442: } else {
443: return $_[1];
444: }
1.4 albertel 445: }
446:
1.24 ng 447: sub var_in_tex {
1.73 albertel 448: if ( $external::target eq "tex" ) {
449: return $_[0];
450: } else {
451: return "";
452: }
1.24 ng 453: }
454:
1.4 albertel 455: sub web {
1.73 albertel 456: if ( $external::target eq "tex" ) {
457: return $_[1];
1.26 ng 458: } else {
1.73 albertel 459: if ( $external::target eq "web" || $external::target eq "answer") {
460: return $_[2];
461: } else {
462: return $_[0];
463: }
1.4 albertel 464: }
465: }
466:
1.24 ng 467: sub html {
1.73 albertel 468: if ( $external::target eq "web" ) {
469: return shift;
470: }
1.24 ng 471: }
472:
1.1 harris41 473: sub hinton {
1.73 albertel 474: return 0;
1.1 harris41 475: }
476:
477: sub random {
1.61 albertel 478: my ($start,$end,$step)=@_;
479: if ( ! $hidden::RANDOMINIT ) {
480: if ($external::randomseed == 0) { $external::randomseed=1; }
481: if ($external::randomseed =~/,/) {
1.84 albertel 482: my ($num1,$num2)=split(/,/,$external::randomseed);
483: &random_set_seed(1,abs($num1));
484: } elsif ($external::randomseed =~/:/) {
485: my ($num1,$num2)=split(/:/,$external::randomseed);
1.61 albertel 486: &random_set_seed(abs($num1),abs($num2));
487: } else {
488: &random_set_seed(1,int(abs($external::randomseed)));
489: }
490: &math_random_uniform();
491: $hidden::RANDOMINIT=1;
492: }
493: if (!defined($step)) { $step=1; }
494: my $num=1+int(($end-$start)/$step);
495: my $result=$start + int(&math_random_uniform() * $num)*$step;
496: return $result;
1.1 harris41 497: }
498:
1.26 ng 499: sub random_normal {
1.73 albertel 500: my ($item_cnt,$seed,$av,$std_dev) = @_;
501: my @oldseed=&random_get_seed();
502: my @retArray;
503: &random_set_seed_from_phrase($seed);
504: @retArray=&math_random_normal($item_cnt,$av,$std_dev);
505: &random_set_seed(@oldseed);
506: return @retArray;
1.26 ng 507: }
508:
509: sub random_beta {
1.73 albertel 510: my ($item_cnt,$seed,$aa,$bb) = @_;
511: my @oldseed=&random_get_seed();
512: my @retArray;
513: &random_set_seed_from_phrase($seed);
514: @retArray=&math_random_beta($item_cnt,$aa,$bb);
515: &random_set_seed(@oldseed);
516: return @retArray;
1.26 ng 517: }
518:
519: sub random_gamma {
1.73 albertel 520: my ($item_cnt,$seed,$a,$r) = @_;
521: my @oldseed=&random_get_seed();
522: my @retArray;
523: &random_set_seed_from_phrase($seed);
524: @retArray=&math_random_gamma($item_cnt,$a,$r);
525: &random_set_seed(@oldseed);
526: return @retArray;
1.26 ng 527: }
528:
529: sub random_exponential {
1.73 albertel 530: my ($item_cnt,$seed,$av) = @_;
531: my @oldseed=&random_get_seed();
532: my @retArray;
533: &random_set_seed_from_phrase($seed);
534: @retArray=&math_random_exponential($item_cnt,$av);
535: &random_set_seed(@oldseed);
536: return @retArray;
1.26 ng 537: }
538:
539: sub random_poisson {
1.73 albertel 540: my ($item_cnt,$seed,$mu) = @_;
541: my @oldseed=&random_get_seed();
542: my @retArray;
543: &random_set_seed_from_phrase($seed);
544: @retArray=&math_random_poisson($item_cnt,$mu);
545: &random_set_seed(@oldseed);
546: return @retArray;
1.26 ng 547: }
548:
549: sub random_chi {
1.73 albertel 550: my ($item_cnt,$seed,$df) = @_;
551: my @oldseed=&random_get_seed();
552: my @retArray;
553: &random_set_seed_from_phrase($seed);
554: @retArray=&math_random_chi_square($item_cnt,$df);
555: &random_set_seed(@oldseed);
556: return @retArray;
1.26 ng 557: }
558:
559: sub random_noncentral_chi {
1.73 albertel 560: my ($item_cnt,$seed,$df,$nonc) = @_;
561: my @oldseed=&random_get_seed();
562: my @retArray;
563: &random_set_seed_from_phrase($seed);
564: @retArray=&math_random_noncentral_chi_square($item_cnt,$df,$nonc);
565: &random_set_seed(@oldseed);
566: return @retArray;
1.26 ng 567: }
568:
569: sub random_f {
1.73 albertel 570: my ($item_cnt,$seed,$dfn,$dfd) = @_;
571: my @oldseed=&random_get_seed();
572: my @retArray;
573: &random_set_seed_from_phrase($seed);
574: @retArray=&math_random_f($item_cnt,$dfn,$dfd);
575: &random_set_seed(@oldseed);
576: return @retArray;
1.26 ng 577: }
578:
579: sub random_noncentral_f {
1.73 albertel 580: my ($item_cnt,$seed,$dfn,$dfd,$nonc) = @_;
581: my @oldseed=&random_get_seed();
582: my @retArray;
583: &random_set_seed_from_phrase($seed);
584: @retArray=&math_random_noncentral_f($item_cnt,$dfn,$dfd,$nonc);
585: &random_set_seed(@oldseed);
586: return @retArray;
1.26 ng 587: }
588:
589: sub random_multivariate_normal {
1.73 albertel 590: my ($item_cnt,$seed,$mean,$covar) = @_;
591: my @oldseed=&random_get_seed();
592: &random_set_seed_from_phrase($seed);
1.87 albertel 593: my @retArray=&math_random_multivariate_normal($item_cnt,@$mean,@$covar);
1.73 albertel 594: &random_set_seed(@oldseed);
595: return @retArray;
1.26 ng 596: }
597:
598: sub random_multinomial {
1.73 albertel 599: my ($item_cnt,$seed,@p) = @_;
600: my @oldseed=&random_get_seed();
601: my @retArray;
602: &random_set_seed_from_phrase($seed);
1.87 albertel 603: my @retArray=&math_random_multinomial($item_cnt,@p);
1.73 albertel 604: &random_set_seed(@oldseed);
605: return @retArray;
1.26 ng 606: }
607:
608: sub random_permutation {
1.73 albertel 609: my ($seed,@inArray) = @_;
610: my @oldseed=&random_get_seed();
611: my @retArray;
612: &random_set_seed_from_phrase($seed);
613: @retArray=&math_random_permutation(@inArray);
614: &random_set_seed(@oldseed);
615: return @retArray;
1.26 ng 616: }
617:
618: sub random_uniform {
1.73 albertel 619: my ($item_cnt,$seed,$low,$high) = @_;
620: my @oldseed=&random_get_seed();
621: my @retArray;
622: &random_set_seed_from_phrase($seed);
623: @retArray=&math_random_uniform($item_cnt,$low,$high);
624: &random_set_seed(@oldseed);
625: return @retArray;
1.26 ng 626: }
627:
628: sub random_uniform_integer {
1.73 albertel 629: my ($item_cnt,$seed,$low,$high) = @_;
630: my @oldseed=&random_get_seed();
631: my @retArray;
632: &random_set_seed_from_phrase($seed);
633: @retArray=&math_random_uniform_integer($item_cnt,$low,$high);
634: &random_set_seed(@oldseed);
635: return @retArray;
1.26 ng 636: }
637:
638: sub random_binomial {
1.73 albertel 639: my ($item_cnt,$seed,$nt,$p) = @_;
640: my @oldseed=&random_get_seed();
641: my @retArray;
642: &random_set_seed_from_phrase($seed);
643: @retArray=&math_random_binomial($item_cnt,$nt,$p);
644: &random_set_seed(@oldseed);
645: return @retArray;
1.26 ng 646: }
647:
648: sub random_negative_binomial {
1.73 albertel 649: my ($item_cnt,$seed,$ne,$p) = @_;
650: my @oldseed=&random_get_seed();
651: my @retArray;
652: &random_set_seed_from_phrase($seed);
653: @retArray=&math_random_negative_binomial($item_cnt,$ne,$p);
654: &random_set_seed(@oldseed);
655: return @retArray;
1.26 ng 656: }
657:
1.103 albertel 658: sub abs { CORE::abs(shift) }
659: sub sin { CORE::sin(shift) }
660: sub cos { CORE::cos(shift) }
661: sub exp { CORE::exp(shift) }
662: sub int { CORE::int(shift) }
663: sub log { CORE::log(shift) }
664: sub atan2 { CORE::atan2($_[0],$_[1]) }
665: sub sqrt { CORE::sqrt(shift) }
1.23 ng 666:
1.59 albertel 667: sub tan { CORE::sin($_[0]) / CORE::cos($_[0]) }
1.21 harris41 668: #sub atan { atan2($_[0], 1); }
669: #sub acos { atan2(sqrt(1 - $_[0] * $_[0]), $_[0] ); }
670: #sub asin { atan2($_[0], sqrt(1- $_[0] * $_[0]) ); }
1.22 ng 671:
1.59 albertel 672: sub log10 { CORE::log($_[0])/CORE::log(10); }
1.22 ng 673:
1.20 harris41 674: sub factorial {
1.59 albertel 675: my $input = CORE::int(shift);
1.20 harris41 676: return "Error - unable to take factorial of an negative number ($input)" if $input < 0;
677: return "Error - factorial result is greater than system limit ($input)" if $input > 170;
678: return 1 if $input == 0;
679: my $result = 1;
680: for (my $i=2; $i<=$input; $i++) { $result *= $i }
681: return $result;
682: }
683:
684: sub sgn {
685: return -1 if $_[0] < 0;
686: return 0 if $_[0] == 0;
687: return 1 if $_[0] > 0;
688: }
689:
690: sub min {
691: my @sorted = sort { $a <=> $b || $a cmp $b } @_;
692: return shift @sorted;
693: }
694:
695: sub max {
696: my @sorted = sort { $a <=> $b || $a cmp $b } @_;
697: return pop @sorted;
698: }
1.1 harris41 699:
1.20 harris41 700: sub roundto {
701: my ($input,$n) = @_;
702: return sprintf('%.'.$n.'f',$input);
703: }
704:
705: sub to_string {
706: my ($input,$n) = @_;
1.26 ng 707: return sprintf($input) if $n eq "";
708: $n = '.'.$n if $n !~ /^\./;
1.20 harris41 709: return sprintf('%'.$n,$input) if $n ne "";
710: }
711:
712: sub sub_string {
713: my ($str,$start,$len) = @_;
714: return substr($str,$start-1,$len);
715: }
1.1 harris41 716:
717: sub pow {return $_[0] ** $_[1]; }
1.59 albertel 718: sub ceil {return (($_[0]-CORE::int($_[0]))== 0.0) ? $_[0] : (($_[0] > 0) ? (CORE::int($_[0])+ 1) : CORE::int($_[0])); }
719: sub floor {return (($_[0]-CORE::int($_[0]))== 0.0) ? $_[0] : (($_[0] > 0) ? CORE::int($_[0]) : (CORE::int($_[0])-1)); }
1.27 ng 720: #sub floor {return int($_[0]); }
1.1 harris41 721:
1.2 albertel 722: sub format {
1.73 albertel 723: my ($value,$fmt)=@_;
1.81 albertel 724: my ($dollarmode,$commamode,$alwaysperiod,$options);
725: if ($fmt =~ /^([^\d]*)(.*)/) { $options=$1; $fmt=$2; }
726: #if ($options =~ /\$/) { $dollamode=1; }
727: #if ($options =~ /,/) { $commamode=1; }
1.82 albertel 728: if ($options =~ /\./) { $alwaysperiod=1; }
1.99 ng 729: my $result;
1.97 albertel 730: if ($fmt=~/s$/i) {
731: $result=&format_significant_figures($value,$fmt);
732: } else {
733: $fmt=~s/e/E/g;
1.99 ng 734: $result=sprintf('%.'.$fmt,$value);
1.97 albertel 735: if ($alwaysperiod && $fmt eq '0f') { $result .='.'; }
736: $result=~s/(E[+-]*)0/$1/;
737: }
1.81 albertel 738: #if ($dollarmode) {$result=&dollarformat($result);}
739: #if ($commamode) {$result=&commaformat($result);}
1.73 albertel 740: return $result;
1.46 albertel 741: }
742:
1.75 albertel 743: sub chemparse {
744: my ($reaction) = @_;
1.96 albertel 745: my @tokens = split(/(\s\+|\->|<=>|<\-|\.)/,$reaction);
1.75 albertel 746: my $formula = '';
747: foreach my $token (@tokens) {
748: if ($token eq '->' ) {
749: $formula .= '<m>\ensuremath{\rightarrow}</m> ';
750: next;
751: }
1.96 albertel 752: if ($token eq '<-' ) {
753: $formula .= '<m>\ensuremath{\leftarrow}</m> ';
754: next;
755: }
1.75 albertel 756: if ($token eq '<=>') {
757: if ($external::target eq 'web' &&
758: &EXT('request.browser.unicode')) {
1.76 albertel 759: $formula .= '⇌ ';
1.75 albertel 760: } else {
761: $formula .= &web('<=> ','<m>\ensuremath{\rightleftharpoons}</m> ',
1.95 albertel 762: '<=> ');
1.75 albertel 763: }
764: next;
765: }
1.96 albertel 766: if ($token eq '.') {
767: $formula =~ s/(\ \;| )$//;
768: $formula .= '·';
769: next;
770: }
771: $token =~ /^\s*([\d|\/]*(?:&frac\d\d)?)(.*)/;
1.90 albertel 772: $formula .= $1 if ($1 ne '1'); # stoichiometric coefficient
1.75 albertel 773:
774: my $molecule = $2;
775: # subscripts
1.78 albertel 776: $molecule =~ s|(?<=[a-zA-Z\)\]\s])(\d+)|<sub>$1</sub>|g;
1.75 albertel 777: # superscripts
778: $molecule =~ s|\^(\d*[+\-]*)|<sup>$1</sup>|g;
779: # strip whitespace
780: $molecule =~ s/\s*//g;
781: # forced space
782: $molecule =~ s/_/ /g;
1.96 albertel 783: $molecule =~ s/-/−/g;
1.75 albertel 784: $formula .= $molecule.' ';
785: }
786: # get rid of trailing space
1.87 albertel 787: $formula =~ s/(\ \;| )$//;
1.75 albertel 788: return &xmlparse($formula);
789: }
790:
1.46 albertel 791: sub prettyprint {
1.73 albertel 792: my ($value,$fmt,$target)=@_;
793: my $result;
794: if (!$target) { $target = $external::target; }
1.75 albertel 795: if ($fmt =~ /chem/i) { return(&chemparse($value)); }
1.81 albertel 796: my ($dollarmode,$commamode,$alwaysperiod,$options);
797: if ($fmt =~ /^([^\d]*)(.*)/) { $options=$1; $fmt=$2; }
1.86 albertel 798: if ($options =~ /\$/) { $dollarmode=1; }
1.81 albertel 799: if ($options =~ /,/) { $commamode=1; }
800: if ($options =~ /\./) { $alwaysperiod=1; }
1.97 albertel 801: if ($fmt=~/s$/i) {
802: $value=&format_significant_figures($value,$fmt);
803: } elsif ($fmt) {
804: $value=sprintf('%.'.$fmt,$value);
805: }
1.81 albertel 806: if ($alwaysperiod && $fmt eq '0f') {
807: if ($target eq 'tex') {
808: $value .='\\ensuremath{.}';
809: } else {
810: $value .='.';
811: }
812: }
1.73 albertel 813: if ($value =~ /([0-9\.\-\+]+)E([0-9\-\+]+)/i ) {
814: my $frac=$1;
815: if ($dollarmode) { $frac=&dollarformat($frac); }
1.80 albertel 816: if ($commamode) { $frac=&commaformat($frac); }
1.73 albertel 817: my $exponent=$2;
818: $exponent=~s/^\+0*//;
819: $exponent=~s/^-0*/-/;
820: $exponent=~s/^-0*/-/;
821: if ($exponent eq '-') { undef($exponent); }
822: if ($exponent) {
823: if ($target eq 'web') {
824: $result=$frac.'×10<sup>'.$exponent.'</sup>';
825: } elsif ($target eq 'tex') {
826: $result='\ensuremath{'.$frac.'\times 10^{'.$exponent.'}}';
827: } else {
828: $result=$value;
829: }
830: } else {
831: $result=$frac;
832: }
833: } else {
1.48 albertel 834: $result=$value;
1.86 albertel 835: if ($dollarmode) { $result=&dollarformat($result,$target); }
836: elsif ($commamode) { $result=&commaformat($result,$target); }
1.46 albertel 837: }
1.73 albertel 838: return $result;
1.48 albertel 839: }
840:
1.80 albertel 841: sub commaformat {
1.73 albertel 842: my ($number,$target) = @_;
843: if ($number =~ /\./) {
1.102 albertel 844: while ($number =~ /([^0-9]*)([0-9]+)([^\.,][^\.,][^\.,])([,0-9]*\.[0-9]*)$/) {
845: $number = $1.$2.','.$3.$4;
1.73 albertel 846: }
847: } else {
1.102 albertel 848: while ($number =~ /^([^0-9]*)([0-9]+)([^,][^,][^,])([,0-9]*)$/) {
849: $number = $1.$2.','.$3.$4;
1.73 albertel 850: }
851: }
1.80 albertel 852: return $number;
853: }
854:
855: sub dollarformat {
856: my ($number,$target) = @_;
857: if (!$target) { $target = $external::target; }
858: $number=&commaformat($number,$target);
1.73 albertel 859: if ($target eq 'tex') {
860: $number='\$'.$number; #' stupid emacs
861: } else {
862: $number='$'.$number; #' stupid emacs
863: }
864: return $number;
1.2 albertel 865: }
1.5 albertel 866:
1.97 albertel 867: # format of form ns or nS where n is an integer
868: sub format_significant_figures {
869: my ($number,$format) = @_;
870: return '0' if ($number == 0);
871: # extract number of significant figures needed
872: my ($sig) = ($format =~ /(\d+)s/i);
873: # arbitrary choice - suggestions ?? or throw error message?
874: $sig = 3 if ($sig eq '');
875: # save the minus sign
876: my $sign = ($number < 0) ? '-' : '';
877: $number = abs($number);
878: # needed to correct for a number greater than 1 (or
879: my $power = ($number < 1) ? 0 : 1;
880: # could round up. Take the integer part of log10.
881: my $x10 = int(log($number)/log(10));
882: # find number with values left of decimal pt = # of sign figs.
883: my $xsig = $number*10**($sig-$x10-$power);
884: # get just digits left of decimal pt - also rounds off correctly
885: my $xint = sprintf('%.0f',$xsig);
886: # save any trailing zero's
887: my ($zeros) = ($xint =~ /(0+)$/);
888: # return number to original magnitude
889: my $numSig = $xint*10**($x10-$sig+$power);
890: # insert trailing zero's if have decimal point
891: $numSig =~ s/^(\d+)\.(\d+)(\e?(.*)?)$/$1\.$2$zeros$3/;
1.98 albertel 892: # put a decimal pt for number ending with 0 and length = # of sig fig
893: $numSig.='.' if (length($numSig) == $sig && $numSig =~ /0$/);
894: if (length($numSig) < $sig) {
895: $numSig.='.'.substr($zeros,0,($sig-length($numSig)));
896: }
1.97 albertel 897: # return number with sign
898: return $sign.$numSig;
899:
900: }
901:
1.5 albertel 902: sub map {
1.27 ng 903: my ($phrase,$dest,$source)=@_;
1.51 albertel 904: my @oldseed=&random_get_seed();
1.27 ng 905: my @seed = &random_seed_from_phrase($phrase);
906: &random_set_seed(@seed);
907: my $destct = scalar(@$dest);
1.28 ng 908: if (!$source) {
909: my @output;
910: my @idx = &math_random_permuted_index($destct);
911: my $ctr = 0;
912: while ($ctr < $destct) {
913: $output[$ctr] = $$dest[$idx[$ctr]];
1.27 ng 914: $ctr++;
1.28 ng 915: }
1.51 albertel 916: &random_set_seed(@oldseed);
1.28 ng 917: return @output;
1.27 ng 918: } else {
1.28 ng 919: my $num = scalar(@$source);
920: my @idx = &math_random_permuted_index($num);
921: my $ctr = 0;
922: my $tot = $num;
923: $tot = $destct if $destct < $num;
924: if (ref($$dest[0])) {
925: while ($ctr < $tot) {
926: ${$$dest[$ctr]} = $$source[$idx[$ctr]];
927: $ctr++;
928: }
929: } else {
930: while ($ctr < $tot) {
931: $$dest[$ctr] = $$source[$idx[$ctr]];
932: $ctr++;
933: }
934: }
1.27 ng 935: }
1.56 albertel 936: &random_set_seed(@oldseed);
1.51 albertel 937: return '';
1.27 ng 938: }
939:
940: sub rmap {
941: my ($phrase,$dest,$source)=@_;
1.51 albertel 942: my @oldseed=&random_get_seed();
1.27 ng 943: my @seed = &random_seed_from_phrase($phrase);
944: &random_set_seed(@seed);
945: my $destct = scalar(@$dest);
1.28 ng 946: if (!$source) {
947: my @idx = &math_random_permuted_index($destct);
948: my $ctr = 0;
949: my @r_idx;
950: while ($ctr < $destct) {
951: $r_idx[$idx[$ctr]] = $ctr;
952: $ctr++;
953: }
954: my @output;
955: $ctr = 0;
956: while ($ctr < $destct) {
957: $output[$ctr] = $$dest[$r_idx[$ctr]];
1.27 ng 958: $ctr++;
1.28 ng 959: }
1.51 albertel 960: &random_set_seed(@oldseed);
1.28 ng 961: return @output;
1.27 ng 962: } else {
1.28 ng 963: my $num = scalar(@$source);
964: my @idx = &math_random_permuted_index($num);
965: my $ctr = 0;
966: my $tot = $num;
967: $tot = $destct if $destct < $num;
968: my @r_idx;
1.27 ng 969: while ($ctr < $tot) {
1.28 ng 970: $r_idx[$idx[$ctr]] = $ctr;
1.27 ng 971: $ctr++;
1.28 ng 972: }
973: $ctr = 0;
974: if (ref($$dest[0])) {
975: while ($ctr < $tot) {
976: ${$$dest[$ctr]} = $$source[$r_idx[$ctr]];
977: $ctr++;
978: }
979: } else {
980: while ($ctr < $tot) {
981: $$dest[$ctr] = $$source[$r_idx[$ctr]];
982: $ctr++;
983: }
984: }
1.6 albertel 985: }
1.51 albertel 986: &random_set_seed(@oldseed);
987: return '';
1.5 albertel 988: }
1.22 ng 989:
1.23 ng 990: sub capa_id { return }
991:
992: sub problem { return }
993:
1.22 ng 994: sub name{
1.73 albertel 995: my $fullname = &EXT('environment.lastname').', '.&EXT('environment.firstname').' '.&EXT('environment.middlename');
996: $fullname = "" if $fullname eq ", ";
997: $fullname =~ s/\%2d/-/g;
998: return $fullname;
1.22 ng 999: }
1000:
1001: sub student_number {
1.73 albertel 1002: my $id = &EXT('environment.id');
1003: $id = '' if $id eq "";
1004: return $id;
1.22 ng 1005: }
1006:
1007: sub class {
1.73 albertel 1008: my $course = &EXT('course.description');
1009: $course = '' if $course eq "";
1010: return $course;
1.22 ng 1011: }
1012:
1.112 www 1013: sub firstname {
1014: my $firstname = &EXT('environment.firstname');
1015: $firstname = '' if $firstname eq "";
1016: return $firstname;
1017: }
1018:
1019: sub lastname {
1020: my $lastname = &EXT('environment.lastname');
1021: $lastname = '' if $lastname eq "";
1022: return $lastname;
1023: }
1024:
1.22 ng 1025: sub sec {
1.73 albertel 1026: my $sec = &EXT('request.course.sec');
1027: $sec = '' if $sec eq "";
1028: return $sec;
1.22 ng 1029: }
1030:
1.23 ng 1031: sub open_date {
1.73 albertel 1032: my @dc = split(/\s+/,localtime(&EXT('resource.0.opendate')));
1033: return '' if ($dc[0] eq "Wed" and $dc[2] == 31 and $dc[4] == 1969);
1034: my @hm = split(/:/,$dc[3]);
1035: my $ampm = " am";
1036: if ($hm[0] > 12) {
1037: $hm[0]-=12;
1038: $ampm = " pm";
1039: }
1040: return $dc[0].', '.$dc[1].' '.$dc[2].', '.$dc[4].' at '.$hm[0].':'.$hm[1].$ampm;
1.23 ng 1041: }
1042:
1043: sub due_date {
1.73 albertel 1044: my @dc = split(/\s+/,localtime(&EXT('resource.0.duedate')));
1045: return '' if ($dc[0] eq "Wed" and $dc[2] == 31 and $dc[4] == 1969);
1046: my @hm = split(/:/,$dc[3]);
1047: my $ampm = " am";
1048: if ($hm[0] > 12) {
1049: $hm[0]-=12;
1050: $ampm = " pm";
1051: }
1052: return $dc[0].', '.$dc[1].' '.$dc[2].', '.$dc[4].' at '.$hm[0].':'.$hm[1].$ampm;
1.23 ng 1053: }
1054:
1055: sub answer_date {
1.73 albertel 1056: my @dc = split(/\s+/,localtime(&EXT('resource.0.answerdate')));
1057: return '' if ($dc[0] eq "Wed" and $dc[2] == 31 and $dc[4] == 1969);
1058: my @hm = split(/:/,$dc[3]);
1059: my $ampm = " am";
1060: if ($hm[0] > 12) {
1061: $hm[0]-=12;
1062: $ampm = " pm";
1063: }
1064: return $dc[0].', '.$dc[1].' '.$dc[2].', '.$dc[4].' at '.$hm[0].':'.$hm[1].$ampm;
1.24 ng 1065: }
1066:
1067: sub array_moments {
1.73 albertel 1068: my @input=@_;
1069: my (@output,$N);
1070: $N=scalar (@input);
1071: $output[0]=$N;
1072: if ($N <= 1) {
1073: $output[1]=$input[0];
1074: $output[1]="Input array not defined" if ($N == 0);
1075: $output[2]="variance undefined for N<=1";
1076: $output[3]="skewness undefined for N<=1";
1077: $output[4]="kurtosis undefined for N<=1";
1078: return @output;
1079: }
1080: my $sum=0;
1081: foreach my $line (@input) {
1082: $sum+=$line;
1083: }
1084: $output[1] = $sum/$N;
1085: my ($x,$sdev,$var,$skew,$kurt) = 0;
1086: foreach my $line (@input) {
1087: $x=$line-$output[1];
1088: $var+=$x**2;
1089: $skew+=$x**3;
1090: $kurt+=$x**4;
1091: }
1092: $output[2]=$var/($N-1);
1093: $sdev=CORE::sqrt($output[2]);
1094: if ($sdev == 0) {
1095: $output[3]="inf-variance=0";
1096: $output[4]="inf-variance=0";
1097: return @output;
1098: }
1099: $output[3]=$skew/($sdev**3*$N);
1100: $output[4]=$kurt/($sdev**4*$N)-3;
1.24 ng 1101: return @output;
1102: }
1.5 albertel 1103:
1104: sub choose {
1.73 albertel 1105: my $num = $_[0];
1106: return $_[$num];
1.5 albertel 1107: }
1.23 ng 1108:
1.101 albertel 1109: #&sum1(1,$x,sub { &sum1($_[0],2*$_[0], sub { fact($_[0])**2 })});
1110: #sub sum1 {
1111: # my ($start,$end,$sub)=@_;
1112: # my $sum=0;
1113: # for (my $i=$start;$i<=$end;$i++) {
1114: # $sum+=&$sub($i);
1115: # }
1116: # return $sum
1117: #}
1118:
1119: #&sum2('a',1,$x,'&sum2(\'b\',$a,2*$a, \'&factorial($b)**2\')');
1120: #sub sum2 {
1121: # my ($varname,$start,$end,$line)=@_;
1122: # my $sum=0;
1123: # for (my $i=$start;$i<=$end;$i++) {
1124: # my $func=sub {
1125: # eval("\$".$varname."=$i");
1126: # eval($line);
1127: # };
1128: # $sum+=&$func($i);
1129: # }
1130: # return $sum
1131: #}
1132:
1.49 albertel 1133: # expiremental idea
1134: sub proper_path {
1.73 albertel 1135: my ($path)=@_;
1136: if ( $external::target eq "tex" ) {
1137: return '/home/httpd/html'.$path;
1138: } else {
1139: return $path;
1140: }
1.49 albertel 1141: }
1.23 ng 1142:
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