Annotation of loncom/homework/default_homework.lcpm, revision 1.139
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: #
1.139 ! raeburn 4: # $Id: default_homework.lcpm,v 1.138 2008/09/06 21:39:15 raeburn 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 $result ");
1.139 ! raeburn 257: return ($result,$reterror);
1.37 albertel 258: }
259:
1.73 albertel 260:
1.37 albertel 261: sub caparesponse_check_list {
1.139 ! raeburn 262: my ($tag) = @_;
1.119 albertel 263: my $responses=$LONCAPA::CAPAresponse_args{'response'};
1.105 albertel 264: &LONCAPA_INTERNAL_DEBUG("args ".join(':',%LONCAPA::CAPAresponse_args));
1.74 albertel 265: my $type = $LONCAPA::CAPAresponse_args{'type'};
1.133 www 266: my $answerunit=$LONCAPA::CAPAresponse_args{'unit'};
267: &LONCAPA_INTERNAL_DEBUG("Got type :$type: answer unit :$answerunit:\n");
1.119 albertel 268:
269: my $num_input_lines =
270: scalar(@{$LONCAPA::CAPAresponse_answer->{'answers'}});
1.120 albertel 271:
272: if ($type ne '' ) {
1.119 albertel 273: if (scalar(@$responses) < $num_input_lines) {
1.105 albertel 274: return 'MISSING_ANSWER';
275: }
1.119 albertel 276: if (scalar(@$responses) > $num_input_lines) {
277: return 'EXTRA_ANSWER';
278: }
279:
280: }
281:
282: foreach my $which (0..($num_input_lines-1)) {
283: my $answer_size =
284: scalar(@{$LONCAPA::CAPAresponse_answer->{'answers'}[$which]});
285: if ($type ne ''
286: && $answer_size > 1) {
287: $responses->[$which]=[split(/,/,$responses->[$which])];
288: } else {
289: $responses->[$which]=[$responses->[$which]];
290: }
291: }
292: foreach my $which (0..($num_input_lines-1)) {
293: my $answer_size =
294: scalar(@{$LONCAPA::CAPAresponse_answer->{'answers'}[$which]});
295: my $response_size =
296: scalar(@{$responses->[$which]});
297: if ($answer_size > $response_size) {
298: return 'MISSING_ANSWER';
299: }
300: if ($answer_size < $response_size) {
1.105 albertel 301: return 'EXTRA_ANSWER';
302: }
1.73 albertel 303: }
1.119 albertel 304:
305: &LONCAPA_INTERNAL_DEBUG("Initial final response :$responses->[0][-1]:");
1.105 albertel 306: my $unit;
1.139 ! raeburn 307: if (($type eq 'float') || (($type eq '') && (($tag ne 'stringresponse') && ($tag ne 'stringhint')) ) ) {
1.73 albertel 308: #for numerical problems split off the unit
1.128 www 309: # if ( $responses->[0][-1]=~ /(.*[^\s])\s+([^\s]+)/ ) {
1.132 www 310: if ( $responses->[0][-1]=~ /^([\d\.\,\s\$]*(?:(?:[xX\*]10[\^\*]*|[eE]*)[\+\-]*\d*)*(?:^|\S)\d+)([\$\s\w\^\*\/\(\)\+\-]*[^\d\.\s\,][\$\s\w\^\*\/\(\)\+\-]*)$/ ) {
1.119 albertel 311: $responses->[0][-1]=$1;
1.128 www 312: $unit=&capa_formula_fix($2);
313: &LONCAPA_INTERNAL_DEBUG("Found unit :$unit:");
1.73 albertel 314: }
315: }
1.119 albertel 316: &LONCAPA_INTERNAL_DEBUG("Final final response :$responses->[0][-1]:$unit:");
1.73 albertel 317: $unit=~s/\s//;
1.133 www 318: foreach my $response (@$responses) {
319: foreach my $element (@$response) {
1.138 raeburn 320: if (($type eq 'float') || (($type eq '') && ($unit ne ''))) {
321: $element =~ s/\s//g;
322: }
1.133 www 323: my $appendunit=$unit;
324: if ($unit=~/\%/) {
325: $element=$element/100;
326: $appendunit=~s/\%//;
327: }
328: if (($element==0) && ($unit!~/\w/) && ($answerunit=~/\w/)) {
329: $appendunit=$answerunit;
330: }
331: $element .= " $appendunit";
332: &LONCAPA_INTERNAL_DEBUG("Made response element :$element:");
333: }
1.119 albertel 334: }
335:
1.117 albertel 336: foreach my $thisanswer (@{ $LONCAPA::CAPAresponse_answer->{'answers'} }) {
337: if (!defined($thisanswer)) {
338: return ('ERROR','answer was undefined');
339: }
340: }
341:
342:
1.121 albertel 343: # &LONCAPA_INTERNAL_DEBUG(&LONCAPA_INTERNAL_Dumper($responses));
1.117 albertel 344: my %memoized;
345: if ($LONCAPA::CAPAresponse_answer->{'type'} eq 'ordered') {
1.119 albertel 346: for (my $i=0; $i<scalar(@$responses);$i++) {
1.117 albertel 347: my $answer = $LONCAPA::CAPAresponse_answer->{'answers'}[$i];
1.119 albertel 348: my $response = $responses->[$i];
1.117 albertel 349: my $key = "$answer\0$response";
1.119 albertel 350: my (@awards,@msgs);
351: for (my $j=0; $j<scalar(@$response); $j++) {
352: my ($award,$msg) = &caparesponse_check($answer->[$j],
353: $response->[$j]);
354: push(@awards,$award);
355: push(@msgs, $msg);
356: }
357: my ($award,$msg) =
358: &LONCAPA_INTERNAL_FINALIZEAWARDS(\@awards,\@msgs);
359: $memoized{$key} = [$award,$msg];
1.117 albertel 360: }
361: } else {
1.119 albertel 362: #FIXME broken with unorder responses where one is a <value>
363: # and the other is a <vector> (need to delay parse til
364: # inside the loop?)
365: foreach my $response (@$responses) {
366: my $response_size = scalar(@{$response});
1.117 albertel 367: foreach my $answer (@{ $LONCAPA::CAPAresponse_answer->{'answers'} }) {
368: my $key = "$answer\0$response";
1.119 albertel 369: my $answer_size = scalar(@{$answer});
370: my ($award,$msg);
371: if ($answer_size > $response_size) {
372: $award = 'MISSING_ANSWER';
373: } elsif ($answer_size < $response_size) {
374: $award = 'EXTRA_ANSWER';
375: } else {
376: my (@awards,@msgs);
377: for (my $j=0; $j<scalar(@$response); $j++) {
378: my ($award,$msg) = &caparesponse_check($answer->[$j],
379: $response->[$j]);
380: push(@awards,$award);
381: push(@msgs, $msg);
382: }
383: ($award,$msg) =
384: &LONCAPA_INTERNAL_FINALIZEAWARDS(\@awards,\@msgs);
385: }
386: $memoized{$key} = [$award,$msg];
1.117 albertel 387: }
388: }
389: }
390:
1.116 albertel 391: my ($final_award,$final_msg);
1.119 albertel 392: &init_permutation(scalar(@$responses),
1.116 albertel 393: $LONCAPA::CAPAresponse_answer->{'type'});
1.117 albertel 394:
1.118 albertel 395: # possible FIXMEs
396: # - significant time is spent calling non-safe space routine
397: # from safe space
398: # - early outs could be possible with classifying awards is to stratas
399: # and stopping as so as hitting the top strata
400: # - some early outs also might be possible with check ing the
401: # memoized hash of results (is correct even possible? etc.)
402:
1.117 albertel 403: my (@final_awards,@final_msg);
1.116 albertel 404: while( &get_permutations_left() ) {
1.117 albertel 405: my $order = &get_next_permutation();
1.116 albertel 406: my (@awards, @msgs, $i);
407: foreach my $thisanswer (@{ $LONCAPA::CAPAresponse_answer->{'answers'} }) {
1.119 albertel 408: my $key = "$thisanswer\0".$responses->[$order->[$i]];
1.117 albertel 409: push(@awards,$memoized{$key}[0]);
410: push(@msgs,$memoized{$key}[1]);
1.116 albertel 411: $i++;
1.119 albertel 412:
1.116 albertel 413: }
1.119 albertel 414: &LONCAPA_INTERNAL_DEBUG(" all awards ".join(':',@awards));
415:
1.116 albertel 416: my ($possible_award,$possible_msg) =
417: &LONCAPA_INTERNAL_FINALIZEAWARDS(\@awards,\@msgs);
1.119 albertel 418: &LONCAPA_INTERNAL_DEBUG(" pos awards ".$possible_award);
1.117 albertel 419: push(@final_awards,$possible_award);
420: push(@final_msg,$possible_msg);
1.73 albertel 421: }
1.117 albertel 422:
1.119 albertel 423: &LONCAPA_INTERNAL_DEBUG(" all final_awards ".join(':',@final_awards));
1.117 albertel 424: my ($final_award,$final_msg) =
425: &LONCAPA_INTERNAL_FINALIZEAWARDS(\@final_awards,\@final_msg,undef,1);
1.116 albertel 426: return ($final_award,$final_msg);
1.7 albertel 427: }
428:
1.124 www 429: sub cas {
1.137 www 430: my ($system,$input,$library)=@_;
1.124 www 431: my $output;
432: if ($system eq 'maxima') {
1.137 www 433: $output=&maxima_eval($input,$library);
434: } else {
435: $output='Error: unrecognized CAS';
1.124 www 436: }
437: return $output;
438: }
439:
1.4 albertel 440: sub tex {
1.73 albertel 441: if ( $external::target eq "tex" ) {
442: return $_[0];
443: } else {
444: return $_[1];
445: }
1.4 albertel 446: }
447:
1.24 ng 448: sub var_in_tex {
1.73 albertel 449: if ( $external::target eq "tex" ) {
450: return $_[0];
451: } else {
452: return "";
453: }
1.24 ng 454: }
455:
1.4 albertel 456: sub web {
1.73 albertel 457: if ( $external::target eq "tex" ) {
458: return $_[1];
1.26 ng 459: } else {
1.73 albertel 460: if ( $external::target eq "web" || $external::target eq "answer") {
461: return $_[2];
462: } else {
463: return $_[0];
464: }
1.4 albertel 465: }
466: }
467:
1.24 ng 468: sub html {
1.73 albertel 469: if ( $external::target eq "web" ) {
470: return shift;
471: }
1.24 ng 472: }
473:
1.1 harris41 474: sub hinton {
1.73 albertel 475: return 0;
1.1 harris41 476: }
477:
478: sub random {
1.61 albertel 479: my ($start,$end,$step)=@_;
480: if ( ! $hidden::RANDOMINIT ) {
481: if ($external::randomseed == 0) { $external::randomseed=1; }
482: if ($external::randomseed =~/,/) {
1.84 albertel 483: my ($num1,$num2)=split(/,/,$external::randomseed);
484: &random_set_seed(1,abs($num1));
485: } elsif ($external::randomseed =~/:/) {
486: my ($num1,$num2)=split(/:/,$external::randomseed);
1.61 albertel 487: &random_set_seed(abs($num1),abs($num2));
488: } else {
489: &random_set_seed(1,int(abs($external::randomseed)));
490: }
491: &math_random_uniform();
492: $hidden::RANDOMINIT=1;
493: }
494: if (!defined($step)) { $step=1; }
495: my $num=1+int(($end-$start)/$step);
496: my $result=$start + int(&math_random_uniform() * $num)*$step;
497: return $result;
1.1 harris41 498: }
499:
1.26 ng 500: sub random_normal {
1.73 albertel 501: my ($item_cnt,$seed,$av,$std_dev) = @_;
502: my @oldseed=&random_get_seed();
503: my @retArray;
504: &random_set_seed_from_phrase($seed);
505: @retArray=&math_random_normal($item_cnt,$av,$std_dev);
506: &random_set_seed(@oldseed);
507: return @retArray;
1.26 ng 508: }
509:
510: sub random_beta {
1.73 albertel 511: my ($item_cnt,$seed,$aa,$bb) = @_;
512: my @oldseed=&random_get_seed();
513: my @retArray;
514: &random_set_seed_from_phrase($seed);
515: @retArray=&math_random_beta($item_cnt,$aa,$bb);
516: &random_set_seed(@oldseed);
517: return @retArray;
1.26 ng 518: }
519:
520: sub random_gamma {
1.73 albertel 521: my ($item_cnt,$seed,$a,$r) = @_;
522: my @oldseed=&random_get_seed();
523: my @retArray;
524: &random_set_seed_from_phrase($seed);
525: @retArray=&math_random_gamma($item_cnt,$a,$r);
526: &random_set_seed(@oldseed);
527: return @retArray;
1.26 ng 528: }
529:
530: sub random_exponential {
1.73 albertel 531: my ($item_cnt,$seed,$av) = @_;
532: my @oldseed=&random_get_seed();
533: my @retArray;
534: &random_set_seed_from_phrase($seed);
535: @retArray=&math_random_exponential($item_cnt,$av);
536: &random_set_seed(@oldseed);
537: return @retArray;
1.26 ng 538: }
539:
540: sub random_poisson {
1.73 albertel 541: my ($item_cnt,$seed,$mu) = @_;
542: my @oldseed=&random_get_seed();
543: my @retArray;
544: &random_set_seed_from_phrase($seed);
545: @retArray=&math_random_poisson($item_cnt,$mu);
546: &random_set_seed(@oldseed);
547: return @retArray;
1.26 ng 548: }
549:
550: sub random_chi {
1.73 albertel 551: my ($item_cnt,$seed,$df) = @_;
552: my @oldseed=&random_get_seed();
553: my @retArray;
554: &random_set_seed_from_phrase($seed);
555: @retArray=&math_random_chi_square($item_cnt,$df);
556: &random_set_seed(@oldseed);
557: return @retArray;
1.26 ng 558: }
559:
560: sub random_noncentral_chi {
1.73 albertel 561: my ($item_cnt,$seed,$df,$nonc) = @_;
562: my @oldseed=&random_get_seed();
563: my @retArray;
564: &random_set_seed_from_phrase($seed);
565: @retArray=&math_random_noncentral_chi_square($item_cnt,$df,$nonc);
566: &random_set_seed(@oldseed);
567: return @retArray;
1.26 ng 568: }
569:
570: sub random_f {
1.73 albertel 571: my ($item_cnt,$seed,$dfn,$dfd) = @_;
572: my @oldseed=&random_get_seed();
573: my @retArray;
574: &random_set_seed_from_phrase($seed);
575: @retArray=&math_random_f($item_cnt,$dfn,$dfd);
576: &random_set_seed(@oldseed);
577: return @retArray;
1.26 ng 578: }
579:
580: sub random_noncentral_f {
1.73 albertel 581: my ($item_cnt,$seed,$dfn,$dfd,$nonc) = @_;
582: my @oldseed=&random_get_seed();
583: my @retArray;
584: &random_set_seed_from_phrase($seed);
585: @retArray=&math_random_noncentral_f($item_cnt,$dfn,$dfd,$nonc);
586: &random_set_seed(@oldseed);
587: return @retArray;
1.26 ng 588: }
589:
590: sub random_multivariate_normal {
1.73 albertel 591: my ($item_cnt,$seed,$mean,$covar) = @_;
592: my @oldseed=&random_get_seed();
593: &random_set_seed_from_phrase($seed);
1.87 albertel 594: my @retArray=&math_random_multivariate_normal($item_cnt,@$mean,@$covar);
1.73 albertel 595: &random_set_seed(@oldseed);
596: return @retArray;
1.26 ng 597: }
598:
599: sub random_multinomial {
1.73 albertel 600: my ($item_cnt,$seed,@p) = @_;
601: my @oldseed=&random_get_seed();
602: my @retArray;
603: &random_set_seed_from_phrase($seed);
1.87 albertel 604: my @retArray=&math_random_multinomial($item_cnt,@p);
1.73 albertel 605: &random_set_seed(@oldseed);
606: return @retArray;
1.26 ng 607: }
608:
609: sub random_permutation {
1.73 albertel 610: my ($seed,@inArray) = @_;
611: my @oldseed=&random_get_seed();
612: my @retArray;
613: &random_set_seed_from_phrase($seed);
614: @retArray=&math_random_permutation(@inArray);
615: &random_set_seed(@oldseed);
616: return @retArray;
1.26 ng 617: }
618:
619: sub random_uniform {
1.73 albertel 620: my ($item_cnt,$seed,$low,$high) = @_;
621: my @oldseed=&random_get_seed();
622: my @retArray;
623: &random_set_seed_from_phrase($seed);
624: @retArray=&math_random_uniform($item_cnt,$low,$high);
625: &random_set_seed(@oldseed);
626: return @retArray;
1.26 ng 627: }
628:
629: sub random_uniform_integer {
1.73 albertel 630: my ($item_cnt,$seed,$low,$high) = @_;
631: my @oldseed=&random_get_seed();
632: my @retArray;
633: &random_set_seed_from_phrase($seed);
634: @retArray=&math_random_uniform_integer($item_cnt,$low,$high);
635: &random_set_seed(@oldseed);
636: return @retArray;
1.26 ng 637: }
638:
639: sub random_binomial {
1.73 albertel 640: my ($item_cnt,$seed,$nt,$p) = @_;
641: my @oldseed=&random_get_seed();
642: my @retArray;
643: &random_set_seed_from_phrase($seed);
644: @retArray=&math_random_binomial($item_cnt,$nt,$p);
645: &random_set_seed(@oldseed);
646: return @retArray;
1.26 ng 647: }
648:
649: sub random_negative_binomial {
1.73 albertel 650: my ($item_cnt,$seed,$ne,$p) = @_;
651: my @oldseed=&random_get_seed();
652: my @retArray;
653: &random_set_seed_from_phrase($seed);
654: @retArray=&math_random_negative_binomial($item_cnt,$ne,$p);
655: &random_set_seed(@oldseed);
656: return @retArray;
1.26 ng 657: }
658:
1.103 albertel 659: sub abs { CORE::abs(shift) }
660: sub sin { CORE::sin(shift) }
661: sub cos { CORE::cos(shift) }
662: sub exp { CORE::exp(shift) }
663: sub int { CORE::int(shift) }
664: sub log { CORE::log(shift) }
665: sub atan2 { CORE::atan2($_[0],$_[1]) }
666: sub sqrt { CORE::sqrt(shift) }
1.23 ng 667:
1.59 albertel 668: sub tan { CORE::sin($_[0]) / CORE::cos($_[0]) }
1.21 harris41 669: #sub atan { atan2($_[0], 1); }
670: #sub acos { atan2(sqrt(1 - $_[0] * $_[0]), $_[0] ); }
671: #sub asin { atan2($_[0], sqrt(1- $_[0] * $_[0]) ); }
1.22 ng 672:
1.59 albertel 673: sub log10 { CORE::log($_[0])/CORE::log(10); }
1.22 ng 674:
1.20 harris41 675: sub factorial {
1.59 albertel 676: my $input = CORE::int(shift);
1.20 harris41 677: return "Error - unable to take factorial of an negative number ($input)" if $input < 0;
678: return "Error - factorial result is greater than system limit ($input)" if $input > 170;
679: return 1 if $input == 0;
680: my $result = 1;
681: for (my $i=2; $i<=$input; $i++) { $result *= $i }
682: return $result;
683: }
684:
685: sub sgn {
686: return -1 if $_[0] < 0;
687: return 0 if $_[0] == 0;
688: return 1 if $_[0] > 0;
689: }
690:
691: sub min {
692: my @sorted = sort { $a <=> $b || $a cmp $b } @_;
693: return shift @sorted;
694: }
695:
696: sub max {
697: my @sorted = sort { $a <=> $b || $a cmp $b } @_;
698: return pop @sorted;
699: }
1.1 harris41 700:
1.20 harris41 701: sub roundto {
702: my ($input,$n) = @_;
703: return sprintf('%.'.$n.'f',$input);
704: }
705:
706: sub to_string {
707: my ($input,$n) = @_;
1.26 ng 708: return sprintf($input) if $n eq "";
709: $n = '.'.$n if $n !~ /^\./;
1.20 harris41 710: return sprintf('%'.$n,$input) if $n ne "";
711: }
712:
713: sub sub_string {
714: my ($str,$start,$len) = @_;
715: return substr($str,$start-1,$len);
716: }
1.1 harris41 717:
718: sub pow {return $_[0] ** $_[1]; }
1.59 albertel 719: sub ceil {return (($_[0]-CORE::int($_[0]))== 0.0) ? $_[0] : (($_[0] > 0) ? (CORE::int($_[0])+ 1) : CORE::int($_[0])); }
720: sub floor {return (($_[0]-CORE::int($_[0]))== 0.0) ? $_[0] : (($_[0] > 0) ? CORE::int($_[0]) : (CORE::int($_[0])-1)); }
1.27 ng 721: #sub floor {return int($_[0]); }
1.1 harris41 722:
1.2 albertel 723: sub format {
1.73 albertel 724: my ($value,$fmt)=@_;
1.81 albertel 725: my ($dollarmode,$commamode,$alwaysperiod,$options);
726: if ($fmt =~ /^([^\d]*)(.*)/) { $options=$1; $fmt=$2; }
727: #if ($options =~ /\$/) { $dollamode=1; }
728: #if ($options =~ /,/) { $commamode=1; }
1.82 albertel 729: if ($options =~ /\./) { $alwaysperiod=1; }
1.99 ng 730: my $result;
1.97 albertel 731: if ($fmt=~/s$/i) {
732: $result=&format_significant_figures($value,$fmt);
733: } else {
734: $fmt=~s/e/E/g;
1.99 ng 735: $result=sprintf('%.'.$fmt,$value);
1.97 albertel 736: if ($alwaysperiod && $fmt eq '0f') { $result .='.'; }
737: $result=~s/(E[+-]*)0/$1/;
738: }
1.81 albertel 739: #if ($dollarmode) {$result=&dollarformat($result);}
740: #if ($commamode) {$result=&commaformat($result);}
1.73 albertel 741: return $result;
1.46 albertel 742: }
743:
1.75 albertel 744: sub chemparse {
745: my ($reaction) = @_;
1.96 albertel 746: my @tokens = split(/(\s\+|\->|<=>|<\-|\.)/,$reaction);
1.75 albertel 747: my $formula = '';
748: foreach my $token (@tokens) {
749: if ($token eq '->' ) {
750: $formula .= '<m>\ensuremath{\rightarrow}</m> ';
751: next;
752: }
1.96 albertel 753: if ($token eq '<-' ) {
754: $formula .= '<m>\ensuremath{\leftarrow}</m> ';
755: next;
756: }
1.75 albertel 757: if ($token eq '<=>') {
758: if ($external::target eq 'web' &&
759: &EXT('request.browser.unicode')) {
1.76 albertel 760: $formula .= '⇌ ';
1.75 albertel 761: } else {
762: $formula .= &web('<=> ','<m>\ensuremath{\rightleftharpoons}</m> ',
1.95 albertel 763: '<=> ');
1.75 albertel 764: }
765: next;
766: }
1.96 albertel 767: if ($token eq '.') {
768: $formula =~ s/(\ \;| )$//;
769: $formula .= '·';
770: next;
771: }
772: $token =~ /^\s*([\d|\/]*(?:&frac\d\d)?)(.*)/;
1.90 albertel 773: $formula .= $1 if ($1 ne '1'); # stoichiometric coefficient
1.75 albertel 774:
775: my $molecule = $2;
776: # subscripts
1.78 albertel 777: $molecule =~ s|(?<=[a-zA-Z\)\]\s])(\d+)|<sub>$1</sub>|g;
1.75 albertel 778: # superscripts
779: $molecule =~ s|\^(\d*[+\-]*)|<sup>$1</sup>|g;
780: # strip whitespace
781: $molecule =~ s/\s*//g;
782: # forced space
783: $molecule =~ s/_/ /g;
1.96 albertel 784: $molecule =~ s/-/−/g;
1.75 albertel 785: $formula .= $molecule.' ';
786: }
787: # get rid of trailing space
1.87 albertel 788: $formula =~ s/(\ \;| )$//;
1.75 albertel 789: return &xmlparse($formula);
790: }
791:
1.46 albertel 792: sub prettyprint {
1.73 albertel 793: my ($value,$fmt,$target)=@_;
794: my $result;
795: if (!$target) { $target = $external::target; }
1.75 albertel 796: if ($fmt =~ /chem/i) { return(&chemparse($value)); }
1.81 albertel 797: my ($dollarmode,$commamode,$alwaysperiod,$options);
798: if ($fmt =~ /^([^\d]*)(.*)/) { $options=$1; $fmt=$2; }
1.86 albertel 799: if ($options =~ /\$/) { $dollarmode=1; }
1.81 albertel 800: if ($options =~ /,/) { $commamode=1; }
801: if ($options =~ /\./) { $alwaysperiod=1; }
1.97 albertel 802: if ($fmt=~/s$/i) {
803: $value=&format_significant_figures($value,$fmt);
804: } elsif ($fmt) {
805: $value=sprintf('%.'.$fmt,$value);
806: }
1.81 albertel 807: if ($alwaysperiod && $fmt eq '0f') {
808: if ($target eq 'tex') {
809: $value .='\\ensuremath{.}';
810: } else {
811: $value .='.';
812: }
813: }
1.73 albertel 814: if ($value =~ /([0-9\.\-\+]+)E([0-9\-\+]+)/i ) {
815: my $frac=$1;
816: if ($dollarmode) { $frac=&dollarformat($frac); }
1.80 albertel 817: if ($commamode) { $frac=&commaformat($frac); }
1.73 albertel 818: my $exponent=$2;
819: $exponent=~s/^\+0*//;
820: $exponent=~s/^-0*/-/;
821: $exponent=~s/^-0*/-/;
822: if ($exponent eq '-') { undef($exponent); }
823: if ($exponent) {
824: if ($target eq 'web') {
825: $result=$frac.'×10<sup>'.$exponent.'</sup>';
826: } elsif ($target eq 'tex') {
827: $result='\ensuremath{'.$frac.'\times 10^{'.$exponent.'}}';
828: } else {
829: $result=$value;
830: }
831: } else {
832: $result=$frac;
833: }
834: } else {
1.48 albertel 835: $result=$value;
1.86 albertel 836: if ($dollarmode) { $result=&dollarformat($result,$target); }
837: elsif ($commamode) { $result=&commaformat($result,$target); }
1.46 albertel 838: }
1.73 albertel 839: return $result;
1.48 albertel 840: }
841:
1.80 albertel 842: sub commaformat {
1.73 albertel 843: my ($number,$target) = @_;
844: if ($number =~ /\./) {
1.102 albertel 845: while ($number =~ /([^0-9]*)([0-9]+)([^\.,][^\.,][^\.,])([,0-9]*\.[0-9]*)$/) {
846: $number = $1.$2.','.$3.$4;
1.73 albertel 847: }
848: } else {
1.102 albertel 849: while ($number =~ /^([^0-9]*)([0-9]+)([^,][^,][^,])([,0-9]*)$/) {
850: $number = $1.$2.','.$3.$4;
1.73 albertel 851: }
852: }
1.80 albertel 853: return $number;
854: }
855:
856: sub dollarformat {
857: my ($number,$target) = @_;
858: if (!$target) { $target = $external::target; }
859: $number=&commaformat($number,$target);
1.73 albertel 860: if ($target eq 'tex') {
861: $number='\$'.$number; #' stupid emacs
862: } else {
863: $number='$'.$number; #' stupid emacs
864: }
865: return $number;
1.2 albertel 866: }
1.5 albertel 867:
1.97 albertel 868: # format of form ns or nS where n is an integer
869: sub format_significant_figures {
870: my ($number,$format) = @_;
871: return '0' if ($number == 0);
872: # extract number of significant figures needed
873: my ($sig) = ($format =~ /(\d+)s/i);
874: # arbitrary choice - suggestions ?? or throw error message?
875: $sig = 3 if ($sig eq '');
876: # save the minus sign
877: my $sign = ($number < 0) ? '-' : '';
878: $number = abs($number);
879: # needed to correct for a number greater than 1 (or
880: my $power = ($number < 1) ? 0 : 1;
881: # could round up. Take the integer part of log10.
882: my $x10 = int(log($number)/log(10));
883: # find number with values left of decimal pt = # of sign figs.
884: my $xsig = $number*10**($sig-$x10-$power);
885: # get just digits left of decimal pt - also rounds off correctly
886: my $xint = sprintf('%.0f',$xsig);
887: # save any trailing zero's
888: my ($zeros) = ($xint =~ /(0+)$/);
889: # return number to original magnitude
890: my $numSig = $xint*10**($x10-$sig+$power);
891: # insert trailing zero's if have decimal point
892: $numSig =~ s/^(\d+)\.(\d+)(\e?(.*)?)$/$1\.$2$zeros$3/;
1.98 albertel 893: # put a decimal pt for number ending with 0 and length = # of sig fig
894: $numSig.='.' if (length($numSig) == $sig && $numSig =~ /0$/);
895: if (length($numSig) < $sig) {
896: $numSig.='.'.substr($zeros,0,($sig-length($numSig)));
897: }
1.97 albertel 898: # return number with sign
899: return $sign.$numSig;
900:
901: }
902:
1.5 albertel 903: sub map {
1.27 ng 904: my ($phrase,$dest,$source)=@_;
1.51 albertel 905: my @oldseed=&random_get_seed();
1.27 ng 906: my @seed = &random_seed_from_phrase($phrase);
907: &random_set_seed(@seed);
908: my $destct = scalar(@$dest);
1.28 ng 909: if (!$source) {
910: my @output;
911: my @idx = &math_random_permuted_index($destct);
912: my $ctr = 0;
913: while ($ctr < $destct) {
914: $output[$ctr] = $$dest[$idx[$ctr]];
1.27 ng 915: $ctr++;
1.28 ng 916: }
1.51 albertel 917: &random_set_seed(@oldseed);
1.28 ng 918: return @output;
1.27 ng 919: } else {
1.28 ng 920: my $num = scalar(@$source);
921: my @idx = &math_random_permuted_index($num);
922: my $ctr = 0;
923: my $tot = $num;
924: $tot = $destct if $destct < $num;
925: if (ref($$dest[0])) {
926: while ($ctr < $tot) {
927: ${$$dest[$ctr]} = $$source[$idx[$ctr]];
928: $ctr++;
929: }
930: } else {
931: while ($ctr < $tot) {
932: $$dest[$ctr] = $$source[$idx[$ctr]];
933: $ctr++;
934: }
935: }
1.27 ng 936: }
1.56 albertel 937: &random_set_seed(@oldseed);
1.51 albertel 938: return '';
1.27 ng 939: }
940:
941: sub rmap {
942: my ($phrase,$dest,$source)=@_;
1.51 albertel 943: my @oldseed=&random_get_seed();
1.27 ng 944: my @seed = &random_seed_from_phrase($phrase);
945: &random_set_seed(@seed);
946: my $destct = scalar(@$dest);
1.28 ng 947: if (!$source) {
948: my @idx = &math_random_permuted_index($destct);
949: my $ctr = 0;
950: my @r_idx;
951: while ($ctr < $destct) {
952: $r_idx[$idx[$ctr]] = $ctr;
953: $ctr++;
954: }
955: my @output;
956: $ctr = 0;
957: while ($ctr < $destct) {
958: $output[$ctr] = $$dest[$r_idx[$ctr]];
1.27 ng 959: $ctr++;
1.28 ng 960: }
1.51 albertel 961: &random_set_seed(@oldseed);
1.28 ng 962: return @output;
1.27 ng 963: } else {
1.28 ng 964: my $num = scalar(@$source);
965: my @idx = &math_random_permuted_index($num);
966: my $ctr = 0;
967: my $tot = $num;
968: $tot = $destct if $destct < $num;
969: my @r_idx;
1.27 ng 970: while ($ctr < $tot) {
1.28 ng 971: $r_idx[$idx[$ctr]] = $ctr;
1.27 ng 972: $ctr++;
1.28 ng 973: }
974: $ctr = 0;
975: if (ref($$dest[0])) {
976: while ($ctr < $tot) {
977: ${$$dest[$ctr]} = $$source[$r_idx[$ctr]];
978: $ctr++;
979: }
980: } else {
981: while ($ctr < $tot) {
982: $$dest[$ctr] = $$source[$r_idx[$ctr]];
983: $ctr++;
984: }
985: }
1.6 albertel 986: }
1.51 albertel 987: &random_set_seed(@oldseed);
988: return '';
1.5 albertel 989: }
1.22 ng 990:
1.23 ng 991: sub capa_id { return }
992:
993: sub problem { return }
994:
1.22 ng 995: sub name{
1.73 albertel 996: my $fullname = &EXT('environment.lastname').', '.&EXT('environment.firstname').' '.&EXT('environment.middlename');
997: $fullname = "" if $fullname eq ", ";
998: $fullname =~ s/\%2d/-/g;
999: return $fullname;
1.22 ng 1000: }
1001:
1002: sub student_number {
1.73 albertel 1003: my $id = &EXT('environment.id');
1004: $id = '' if $id eq "";
1005: return $id;
1.22 ng 1006: }
1007:
1008: sub class {
1.73 albertel 1009: my $course = &EXT('course.description');
1010: $course = '' if $course eq "";
1011: return $course;
1.22 ng 1012: }
1013:
1.112 www 1014: sub firstname {
1015: my $firstname = &EXT('environment.firstname');
1016: $firstname = '' if $firstname eq "";
1017: return $firstname;
1018: }
1019:
1020: sub lastname {
1021: my $lastname = &EXT('environment.lastname');
1022: $lastname = '' if $lastname eq "";
1023: return $lastname;
1024: }
1025:
1.22 ng 1026: sub sec {
1.73 albertel 1027: my $sec = &EXT('request.course.sec');
1028: $sec = '' if $sec eq "";
1029: return $sec;
1.22 ng 1030: }
1031:
1.136 www 1032: sub submission {
1033: my ($partid,$responseid,$subnumber)=@_;
1034: my $sub='';
1035: if ($subnumber) { $sub=$subnumber.':'; }
1036: return &EXT('user.resource.'.$sub.'resource.'.$partid.'.'.$responseid.'.submission');
1037: }
1038:
1039: sub currentpart {
1040: return $external::part;
1041: }
1042:
1.135 www 1043: sub eval_time {
1044: my ($timestamp)=@_;
1045: unless ($timestamp) { return ''; }
1046: return &locallocaltime($timestamp);
1047: }
1048:
1.23 ng 1049: sub open_date {
1.134 www 1050: my ($partid)=@_;
1051: unless ($partid) { $partid=0; }
1.135 www 1052: return &eval_time(&EXT('resource.'.$partid.'.opendate'));
1.23 ng 1053: }
1054:
1.134 www 1055: sub due_date {
1056: my ($partid)=@_;
1057: unless ($partid) { $partid=0; }
1.135 www 1058: return &eval_time(&EXT('resource.'.$partid.'.duedate'));
1.23 ng 1059: }
1060:
1061: sub answer_date {
1.134 www 1062: my ($partid)=@_;
1063: unless ($partid) { $partid=0; }
1.135 www 1064: return &eval_time(&EXT('resource.'.$partid.'.answerdate'));
1.24 ng 1065: }
1066:
1.136 www 1067: sub open_date_epoch {
1068: my ($partid)=@_;
1069: unless ($partid) { $partid=0; }
1070: return &EXT('resource.'.$partid.'.opendate');
1071: }
1072:
1073: sub due_date_epoch {
1074: my ($partid)=@_;
1075: unless ($partid) { $partid=0; }
1076: return &EXT('resource.'.$partid.'.duedate');
1077: }
1078:
1079: sub answer_date_epoch {
1080: my ($partid)=@_;
1081: unless ($partid) { $partid=0; }
1082: return &EXT('resource.'.$partid.'.answerdate');
1083: }
1084:
1.24 ng 1085: sub array_moments {
1.73 albertel 1086: my @input=@_;
1087: my (@output,$N);
1088: $N=scalar (@input);
1089: $output[0]=$N;
1090: if ($N <= 1) {
1091: $output[1]=$input[0];
1092: $output[1]="Input array not defined" if ($N == 0);
1093: $output[2]="variance undefined for N<=1";
1094: $output[3]="skewness undefined for N<=1";
1095: $output[4]="kurtosis undefined for N<=1";
1096: return @output;
1097: }
1098: my $sum=0;
1099: foreach my $line (@input) {
1100: $sum+=$line;
1101: }
1102: $output[1] = $sum/$N;
1103: my ($x,$sdev,$var,$skew,$kurt) = 0;
1104: foreach my $line (@input) {
1105: $x=$line-$output[1];
1106: $var+=$x**2;
1107: $skew+=$x**3;
1108: $kurt+=$x**4;
1109: }
1110: $output[2]=$var/($N-1);
1111: $sdev=CORE::sqrt($output[2]);
1112: if ($sdev == 0) {
1113: $output[3]="inf-variance=0";
1114: $output[4]="inf-variance=0";
1115: return @output;
1116: }
1117: $output[3]=$skew/($sdev**3*$N);
1118: $output[4]=$kurt/($sdev**4*$N)-3;
1.24 ng 1119: return @output;
1120: }
1.5 albertel 1121:
1122: sub choose {
1.73 albertel 1123: my $num = $_[0];
1124: return $_[$num];
1.5 albertel 1125: }
1.23 ng 1126:
1.101 albertel 1127: #&sum1(1,$x,sub { &sum1($_[0],2*$_[0], sub { fact($_[0])**2 })});
1128: #sub sum1 {
1129: # my ($start,$end,$sub)=@_;
1130: # my $sum=0;
1131: # for (my $i=$start;$i<=$end;$i++) {
1132: # $sum+=&$sub($i);
1133: # }
1134: # return $sum
1135: #}
1136:
1137: #&sum2('a',1,$x,'&sum2(\'b\',$a,2*$a, \'&factorial($b)**2\')');
1138: #sub sum2 {
1139: # my ($varname,$start,$end,$line)=@_;
1140: # my $sum=0;
1141: # for (my $i=$start;$i<=$end;$i++) {
1142: # my $func=sub {
1143: # eval("\$".$varname."=$i");
1144: # eval($line);
1145: # };
1146: # $sum+=&$func($i);
1147: # }
1148: # return $sum
1149: #}
1150:
1.49 albertel 1151: # expiremental idea
1152: sub proper_path {
1.73 albertel 1153: my ($path)=@_;
1154: if ( $external::target eq "tex" ) {
1155: return '/home/httpd/html'.$path;
1156: } else {
1157: return $path;
1158: }
1.49 albertel 1159: }
1.23 ng 1160:
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