1: # The LearningOnline Network with CAPA
2: # used by lonxml::xmlparse() as input variable $safeinit to Apache::run::run()
3: #
4: # $Id: default_homework.lcpm,v 1.70 2004/03/12 16:55:35 albertel Exp $
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: #
28: #
29: # Guy Albertelli
30: #
31: # 05/25/2001 H. K. Ng
32: # 05/31/2001 H. K. Ng
33: # 12/21/2001 Matthew
34: #
35: #init some globals
36: $hidden::RANDOMINIT=0;
37: $pi=atan2(1,1)*4;
38: $rad2deg=180.0/$pi;
39: $deg2rad=$pi/180.0;
40: $"=' ';
41:
42: sub caparesponse_check {
43: #not properly used yet: calc
44: #not to be used: $ans_fmt
45: my ($type,$tol,$sig,$ans_fmt,$unit,$calc,$samples) =
46: eval $_[2].
47: ';return ($__LC__type,$__LC__tol,$__LC__sig,$__LC__ans_fmt,$__LC__unit,$__LC__calc,$__LC__samples);';
48:
49: my $tol_type=''; # gets it's value from whether tol has a % or not done
50: my $sig_lbound=''; #done
51: my $sig_ubound=''; #done
52: my ($answer,$response,$expr)=@_;
53:
54:
55: #type's definitons come from capaParser.h
56: my $message='';
57: #remove leading and trailing whitespace
58: if ($response=~ /^\s|\s$/) {
59: $response=~ s:^\s+|\s+$::g;
60: $message .="Removed ws now :$response:\n";
61: } else {
62: $message .="no ws in :$response:\n";
63: }
64:
65: if (length($response) > 500) { return "TOO_LONG: Answer too long"; }
66:
67: if ($type eq '' ) {
68: $message .= "Didn't find a type :$type:$expr: defaulting\n";
69: if ( $answer eq ($answer *1.0)) { $type = 2;
70: } else { $type = 3; }
71: } else {
72: if ($type eq 'cs') { $type = 4;
73: } elsif ($type eq 'ci') { $type = 3;
74: } elsif ($type eq 'mc') { $type = 5;
75: } elsif ($type eq 'fml') { $type = 8;
76: } elsif ($type eq 'subj') { $type = 7;
77: } elsif ($type eq 'float') { $type = 2;
78: } elsif ($type eq 'int') { $type = 1;
79: } else { return "ERROR: Unknown type of answer: $type" }
80: }
81:
82: my $points;
83: my $id_list;
84: #formula type setup the sample points
85: if ($type eq '8') {
86: ($id_list,$points)=split(/@/,$samples);
87: $message.="Found :$id_list:$points: points in $samples\n";
88: }
89: if ($tol eq '') {
90: $tol=0.0;
91: $tol_type=1; #TOL_ABSOLUTE
92: } else {
93: if ($tol =~ /%$/) {
94: chop $tol;
95: $tol_type=2; #TOL_PERCENTAGE
96: } else {
97: $tol_type=1; #TOL_ABSOLUTE
98: }
99: }
100:
101: if ($sig eq '') {
102: $sig_lbound = 0; #SIG_LB_DEFAULT
103: $sig_ubound =15; #SIG_UB_DEFAULT
104: } else {
105: ($sig_lbound,$sig_ubound) = split /,/,$sig;
106: if (!defined($sig_lbound)) {
107: $sig_lbound = 0; #SIG_LB_DEFAULT
108: $sig_ubound =15; #SIG_UB_DEFAULT
109: }
110: if (!defined($sig_ubound)) { $sig_ubound=$sig_lbound; }
111: }
112: my $result = &caparesponse_capa_check_answer($response,$answer,$type,
113: $tol_type,$tol,
114: $sig_lbound,$sig_ubound,
115: $ans_fmt,$unit,$calc,$id_list,
116: $points,$external::randomseed);
117:
118: if ($result == '1') { $result='EXACT_ANS'; }
119: elsif ($result == '2') { $result='APPROX_ANS'; }
120: elsif ($result == '3') { $result='SIG_FAIL'; }
121: elsif ($result == '4') { $result='UNIT_FAIL'; }
122: elsif ($result == '5') { $result='NO_UNIT'; }
123: elsif ($result == '6') { $result='UNIT_OK'; }
124: elsif ($result == '7') { $result='INCORRECT'; }
125: elsif ($result == '8') { $result='UNIT_NOTNEEDED'; }
126: elsif ($result == '9') { $result='ANS_CNT_NOT_MATCH'; }
127: elsif ($result =='10') { $result='SUB_RECORDED'; }
128: elsif ($result =='11') { $result='BAD_FORMULA'; }
129: elsif ($result =='12') { $result='WANTED_NUMERIC'; }
130: else {$result = "ERROR: Unknown Result:$result:$@:";}
131:
132: return "$result:\nError $error:\nAnswer $answer:\nResponse $response:\n type-$type|$tol|$tol_type|$sig:$sig_lbound:$sig_ubound|$unit|\n$message$expr";
133: }
134:
135: sub get_array_args {
136: my ($expr,$arg)=@_;
137: # do these first, because who knows what varname the instructor might have used
138: # but it probably isn't $CAPARESPONSE_CHECK_LIST_answer
139: my $CAPARESPONSE_CHECK_LIST_answer = eval $expr.';return $'.$arg; #' stupid emacs
140: my $GET_ARRAY_ARGS_result="expr is $expr\narg is $arg\nfirst answer guess is $CAPARESPONSE_CHECK_LIST_answer\n";
141: my @GET_ARRAY_ARGS_list;
142: if ($CAPARESPONSE_CHECK_LIST_answer =~ /^\s*[\$\@]/) {
143: (@GET_ARRAY_ARGS_list) = eval $CAPARESPONSE_CHECK_LIST_answer;
144: }
145: $GET_ARRAY_ARGS_result.="error:$@:\n";
146: # if the eval fails just use what is in the answer exactly
147: if (!(@GET_ARRAY_ARGS_list) || !defined($GET_ARRAY_ARGS_list[0])) {
148: $GET_ARRAY_ARGS_result.="list zero is undefined\n";
149: $GET_ARRAY_ARGS_list[0]=$CAPARESPONSE_CHECK_LIST_answer;
150: }
151: return $GET_ARRAY_ARGS_result,@GET_ARRAY_ARGS_list;
152: }
153:
154: sub caparesponse_check_list {
155: my ($response,$expr)=@_;
156: # $expr =~ s/\\/\\\\/g;
157: # $expr =~ s/\'/\\\'/g;
158: # my ($result,@list) = &get_array_args($expr,'answer');
159: # $expr =~ s/\\\'/\'/g;
160: # $expr =~ s/\\\\/\\/g;
161: my ($result,@list);
162: @list=@CAPARESPONSE_CHECK_LIST_answer;
163: my $aresult='';
164: my $current_answer;
165: my $answers=join(':',@list);
166: $result.="Got response :$answers:\n";
167: my @responselist;
168: my $type =eval $expr.';return $__LC__type;';
169: $result.="Got type :$type:\n";
170: if ($type ne '' && $#list > 0) {
171: (@responselist)=split /,/,$response;
172: } else {
173: (@responselist)=($response);
174: }
175: my $unit='';
176: $result.="Initial final response :$responselist['-1']:\n";
177: if ($type eq '' || $type eq 'float') {
178: #for numerical problems split off the unit
179: if ( $responselist['-1']=~ /(.*[^\s])\s+([^\s]+)/ ) {
180: $responselist['-1']=$1;
181: $unit=$2;
182: }
183: }
184: $result.="Final final response :$responselist['-1']:\n";
185: $result.=":$#list: answers\n";
186: $unit=~s/\s//;
187: my $i=0;
188: my $awards='';
189: for ($i=0; $i<@list;$i++) {
190: $result.="trying answer :$list[$i]:\n";
191: my $thisanswer=$list[$i];
192: # $thisanswer=~ s/\\/\\\\/g;
193: # $thisanswer =~ s/\'/\\\'/g;
194: $result.="trying answer :$thisanswer:\n";
195: if ($unit eq '') {
196: $aresult=&caparesponse_check($thisanswer,$responselist[$i],
197: $expr);
198: } else {
199: $aresult=&caparesponse_check($thisanswer,$responselist[$i]." $unit",
200: $expr);
201: }
202: my ($temp)=split /:/, $aresult;
203: $awards.="$temp,";
204: $result.=$aresult;
205: }
206: chop $awards;
207: return "$awards:\n$result";
208: }
209:
210: sub tex {
211: if ( $external::target eq "tex" ) {
212: return $_[0];
213: } else {
214: return $_[1];
215: }
216: }
217:
218: sub var_in_tex {
219: if ( $external::target eq "tex" ) {
220: return $_[0];
221: } else {
222: return "";
223: }
224: }
225:
226: sub web {
227: if ( $external::target eq "tex" ) {
228: return $_[1];
229: } else {
230: if ( $external::target eq "web" || $external::target eq "answer") {
231: return $_[2];
232: } else {
233: return $_[0];
234: }
235: }
236: }
237:
238: sub html {
239: if ( $external::target eq "web" ) {
240: return shift;
241: }
242: }
243:
244: sub hinton {
245: return 0;
246: }
247:
248: sub random {
249: my ($start,$end,$step)=@_;
250: if ( ! $hidden::RANDOMINIT ) {
251: if ($external::randomseed == 0) { $external::randomseed=1; }
252: if ($external::randomseed =~/,/) {
253: my ($num1,$num2)=split(/,/,$seed);
254: &random_set_seed(abs($num1),abs($num2));
255: } else {
256: &random_set_seed(1,int(abs($external::randomseed)));
257: }
258: &math_random_uniform();
259: $hidden::RANDOMINIT=1;
260: }
261: if (!defined($step)) { $step=1; }
262: my $num=1+int(($end-$start)/$step);
263: my $result=$start + int(&math_random_uniform() * $num)*$step;
264: return $result;
265: }
266:
267: sub random_normal {
268: my ($item_cnt,$seed,$av,$std_dev) = @_;
269: my @oldseed=&random_get_seed();
270: my @retArray;
271: &random_set_seed_from_phrase($seed);
272: @retArray=&math_random_normal($item_cnt,$av,$std_dev);
273: &random_set_seed(@oldseed);
274: return @retArray;
275: }
276:
277: sub random_beta {
278: my ($item_cnt,$seed,$aa,$bb) = @_;
279: my @oldseed=&random_get_seed();
280: my @retArray;
281: &random_set_seed_from_phrase($seed);
282: @retArray=&math_random_beta($item_cnt,$aa,$bb);
283: &random_set_seed(@oldseed);
284: return @retArray;
285: }
286:
287: sub random_gamma {
288: my ($item_cnt,$seed,$a,$r) = @_;
289: my @oldseed=&random_get_seed();
290: my @retArray;
291: &random_set_seed_from_phrase($seed);
292: @retArray=&math_random_gamma($item_cnt,$a,$r);
293: &random_set_seed(@oldseed);
294: return @retArray;
295: }
296:
297: sub random_exponential {
298: my ($item_cnt,$seed,$av) = @_;
299: my @oldseed=&random_get_seed();
300: my @retArray;
301: &random_set_seed_from_phrase($seed);
302: @retArray=&math_random_exponential($item_cnt,$av);
303: &random_set_seed(@oldseed);
304: return @retArray;
305: }
306:
307: sub random_poisson {
308: my ($item_cnt,$seed,$mu) = @_;
309: my @oldseed=&random_get_seed();
310: my @retArray;
311: &random_set_seed_from_phrase($seed);
312: @retArray=&math_random_poisson($item_cnt,$mu);
313: &random_set_seed(@oldseed);
314: return @retArray;
315: }
316:
317: sub random_chi {
318: my ($item_cnt,$seed,$df) = @_;
319: my @oldseed=&random_get_seed();
320: my @retArray;
321: &random_set_seed_from_phrase($seed);
322: @retArray=&math_random_chi_square($item_cnt,$df);
323: &random_set_seed(@oldseed);
324: return @retArray;
325: }
326:
327: sub random_noncentral_chi {
328: my ($item_cnt,$seed,$df,$nonc) = @_;
329: my @oldseed=&random_get_seed();
330: my @retArray;
331: &random_set_seed_from_phrase($seed);
332: @retArray=&math_random_noncentral_chi_square($item_cnt,$df,$nonc);
333: &random_set_seed(@oldseed);
334: return @retArray;
335: }
336:
337: sub random_f {
338: my ($item_cnt,$seed,$dfn,$dfd) = @_;
339: my @oldseed=&random_get_seed();
340: my @retArray;
341: &random_set_seed_from_phrase($seed);
342: @retArray=&math_random_f($item_cnt,$dfn,$dfd);
343: &random_set_seed(@oldseed);
344: return @retArray;
345: }
346:
347: sub random_noncentral_f {
348: my ($item_cnt,$seed,$dfn,$dfd,$nonc) = @_;
349: my @oldseed=&random_get_seed();
350: my @retArray;
351: &random_set_seed_from_phrase($seed);
352: @retArray=&math_random_noncentral_f($item_cnt,$dfn,$dfd,$nonc);
353: &random_set_seed(@oldseed);
354: return @retArray;
355: }
356:
357: sub random_multivariate_normal {
358: my ($item_cnt,$seed,$mean,$covar) = @_;
359: my @oldseed=&random_get_seed();
360: &random_set_seed_from_phrase($seed);
361: @retArray=&math_random_multivariate_normal($item_cnt,@$mean,@$covar);
362: &random_set_seed(@oldseed);
363: return @retArray;
364: }
365:
366: sub random_multinomial {
367: my ($item_cnt,$seed,@p) = @_;
368: my @oldseed=&random_get_seed();
369: my @retArray;
370: &random_set_seed_from_phrase($seed);
371: @retArray=&math_random_multinomial($item_cnt,@p);
372: &random_set_seed(@oldseed);
373: return @retArray;
374: }
375:
376: sub random_permutation {
377: my ($seed,@inArray) = @_;
378: my @oldseed=&random_get_seed();
379: my @retArray;
380: &random_set_seed_from_phrase($seed);
381: @retArray=&math_random_permutation(@inArray);
382: &random_set_seed(@oldseed);
383: return @retArray;
384: }
385:
386: sub random_uniform {
387: my ($item_cnt,$seed,$low,$high) = @_;
388: my @oldseed=&random_get_seed();
389: my @retArray;
390: &random_set_seed_from_phrase($seed);
391: @retArray=&math_random_uniform($item_cnt,$low,$high);
392: &random_set_seed(@oldseed);
393: return @retArray;
394: }
395:
396: sub random_uniform_integer {
397: my ($item_cnt,$seed,$low,$high) = @_;
398: my @oldseed=&random_get_seed();
399: my @retArray;
400: &random_set_seed_from_phrase($seed);
401: @retArray=&math_random_uniform_integer($item_cnt,$low,$high);
402: &random_set_seed(@oldseed);
403: return @retArray;
404: }
405:
406: sub random_binomial {
407: my ($item_cnt,$seed,$nt,$p) = @_;
408: my @oldseed=&random_get_seed();
409: my @retArray;
410: &random_set_seed_from_phrase($seed);
411: @retArray=&math_random_binomial($item_cnt,$nt,$p);
412: &random_set_seed(@oldseed);
413: return @retArray;
414: }
415:
416: sub random_negative_binomial {
417: my ($item_cnt,$seed,$ne,$p) = @_;
418: my @oldseed=&random_get_seed();
419: my @retArray;
420: &random_set_seed_from_phrase($seed);
421: @retArray=&math_random_negative_binomial($item_cnt,$ne,$p);
422: &random_set_seed(@oldseed);
423: return @retArray;
424: }
425:
426: sub abs { abs(shift) }
427: sub sin { sin(shift) }
428: sub cos { cos(shift) }
429: sub exp { exp(shift) }
430: sub int { int(shift) }
431: sub log { log(shift) }
432: sub atan2 { atan2($_[0],$_[1]) }
433: sub sqrt { sqrt(shift) }
434:
435: sub tan { CORE::sin($_[0]) / CORE::cos($_[0]) }
436: #sub atan { atan2($_[0], 1); }
437: #sub acos { atan2(sqrt(1 - $_[0] * $_[0]), $_[0] ); }
438: #sub asin { atan2($_[0], sqrt(1- $_[0] * $_[0]) ); }
439:
440: sub log10 { CORE::log($_[0])/CORE::log(10); }
441:
442: sub factorial {
443: my $input = CORE::int(shift);
444: return "Error - unable to take factorial of an negative number ($input)" if $input < 0;
445: return "Error - factorial result is greater than system limit ($input)" if $input > 170;
446: return 1 if $input == 0;
447: my $result = 1;
448: for (my $i=2; $i<=$input; $i++) { $result *= $i }
449: return $result;
450: }
451:
452: sub sgn {
453: return -1 if $_[0] < 0;
454: return 0 if $_[0] == 0;
455: return 1 if $_[0] > 0;
456: }
457:
458: sub min {
459: my @sorted = sort { $a <=> $b || $a cmp $b } @_;
460: return shift @sorted;
461: }
462:
463: sub max {
464: my @sorted = sort { $a <=> $b || $a cmp $b } @_;
465: return pop @sorted;
466: }
467:
468: sub roundto {
469: my ($input,$n) = @_;
470: return sprintf('%.'.$n.'f',$input);
471: }
472:
473: sub to_string {
474: my ($input,$n) = @_;
475: return sprintf($input) if $n eq "";
476: $n = '.'.$n if $n !~ /^\./;
477: return sprintf('%'.$n,$input) if $n ne "";
478: }
479:
480: sub sub_string {
481: my ($str,$start,$len) = @_;
482: return substr($str,$start-1,$len);
483: }
484:
485: sub pow {return $_[0] ** $_[1]; }
486: sub ceil {return (($_[0]-CORE::int($_[0]))== 0.0) ? $_[0] : (($_[0] > 0) ? (CORE::int($_[0])+ 1) : CORE::int($_[0])); }
487: sub floor {return (($_[0]-CORE::int($_[0]))== 0.0) ? $_[0] : (($_[0] > 0) ? CORE::int($_[0]) : (CORE::int($_[0])-1)); }
488: #sub floor {return int($_[0]); }
489:
490: sub format {
491: my ($value,$fmt)=@_;
492: my $dollarmode;
493: if ($fmt =~ /^\$(.*)/) { $fmt=$1; $dollarmode=1; }
494: $fmt=~s/e/E/g;
495: my $result=sprintf('%.'.$fmt,$value);
496: $result=~s/(E[+-]*)0/$1/;
497: if ($dollarmode) {$result=&dollarmode($result);}
498: return $result;
499: }
500:
501: sub prettyprint {
502: my ($value,$fmt,$target)=@_;
503: my $result;
504: my $dollarmode;
505: if (!$target) { $target = $external::target; }
506: if ($fmt =~ /^\$(.*)/) { $fmt=$1; $dollarmode=1; }
507: if ($fmt) { $value=sprintf('%.'.$fmt,$value); }
508: if ($value =~ /([0-9\.\-\+]+)E([0-9\-\+]+)/i ) {
509: my $frac=$1;
510: if ($dollarmode) { $frac=&dollarformat($frac); }
511: my $exponent=$2;
512: $exponent=~s/^\+0*//;
513: $exponent=~s/^-0*/-/;
514: $exponent=~s/^-0*/-/;
515: if ($exponent eq '-') { undef($exponent); }
516: if ($exponent) {
517: if ($target eq 'web') {
518: $result=$frac.'×10<sup>'.$exponent.'</sup>';
519: } elsif ($target eq 'tex') {
520: $result='\ensuremath{'.$frac.'\times 10^{'.$exponent.'}}';
521: } else {
522: $result=$value;
523: }
524: } else {
525: $result=$frac;
526: }
527: } else {
528: $result=$value;
529: if ($dollarmode) { $result=&dollarformat($result,$target); }
530: }
531: return $result;
532: }
533:
534: sub dollarformat {
535: my ($number,$target) = @_;
536: if (!$target) { $target = $external::target; }
537: if ($number =~ /\./) {
538: while ($number =~ /([^\.,]+)([^\.,][^\.,][^\.,])([,0-9]*\.[0-9]*$)/) {
539: $number = $1.','.$2.$3;
540: }
541: } else {
542: while ($number =~ /([^,]+)([^,][^,][^,])([,0-9]*)$/) {
543: $number = $1.','.$2.$3;
544: }
545: }
546: if ($target eq 'tex') {
547: $number='\$'.$number; #' stupid emacs
548: } else {
549: $number='$'.$number; #' stupid emacs
550: }
551: return $number;
552: }
553:
554: sub map {
555: my ($phrase,$dest,$source)=@_;
556: my @oldseed=&random_get_seed();
557: my @seed = &random_seed_from_phrase($phrase);
558: &random_set_seed(@seed);
559: my $destct = scalar(@$dest);
560: if (!$source) {
561: my @output;
562: my @idx = &math_random_permuted_index($destct);
563: my $ctr = 0;
564: while ($ctr < $destct) {
565: $output[$ctr] = $$dest[$idx[$ctr]];
566: $ctr++;
567: }
568: &random_set_seed(@oldseed);
569: return @output;
570: } else {
571: my $num = scalar(@$source);
572: my @idx = &math_random_permuted_index($num);
573: my $ctr = 0;
574: my $tot = $num;
575: $tot = $destct if $destct < $num;
576: if (ref($$dest[0])) {
577: while ($ctr < $tot) {
578: ${$$dest[$ctr]} = $$source[$idx[$ctr]];
579: $ctr++;
580: }
581: } else {
582: while ($ctr < $tot) {
583: $$dest[$ctr] = $$source[$idx[$ctr]];
584: $ctr++;
585: }
586: }
587: }
588: &random_set_seed(@oldseed);
589: return '';
590: }
591:
592: sub rmap {
593: my ($phrase,$dest,$source)=@_;
594: my @oldseed=&random_get_seed();
595: my @seed = &random_seed_from_phrase($phrase);
596: &random_set_seed(@seed);
597: my $destct = scalar(@$dest);
598: if (!$source) {
599: my @idx = &math_random_permuted_index($destct);
600: my $ctr = 0;
601: my @r_idx;
602: while ($ctr < $destct) {
603: $r_idx[$idx[$ctr]] = $ctr;
604: $ctr++;
605: }
606: my @output;
607: $ctr = 0;
608: while ($ctr < $destct) {
609: $output[$ctr] = $$dest[$r_idx[$ctr]];
610: $ctr++;
611: }
612: &random_set_seed(@oldseed);
613: return @output;
614: } else {
615: my $num = scalar(@$source);
616: my @idx = &math_random_permuted_index($num);
617: my $ctr = 0;
618: my $tot = $num;
619: $tot = $destct if $destct < $num;
620: my @r_idx;
621: while ($ctr < $tot) {
622: $r_idx[$idx[$ctr]] = $ctr;
623: $ctr++;
624: }
625: $ctr = 0;
626: if (ref($$dest[0])) {
627: while ($ctr < $tot) {
628: ${$$dest[$ctr]} = $$source[$r_idx[$ctr]];
629: $ctr++;
630: }
631: } else {
632: while ($ctr < $tot) {
633: $$dest[$ctr] = $$source[$r_idx[$ctr]];
634: $ctr++;
635: }
636: }
637: }
638: &random_set_seed(@oldseed);
639: return '';
640: }
641:
642: sub capa_id { return }
643:
644: sub problem { return }
645:
646: sub name{
647: my $fullname = &EXT('environment.lastname').', '.&EXT('environment.firstname').' '.&EXT('environment.middlename');
648: $fullname = "" if $fullname eq ", ";
649: $fullname =~ s/\%2d/-/g;
650: return $fullname;
651: }
652:
653: sub student_number {
654: my $id = &EXT('environment.id');
655: $id = '' if $id eq "";
656: return $id;
657: }
658:
659: sub class {
660: my $course = &EXT('course.description');
661: $course = '' if $course eq "";
662: return $course;
663: }
664:
665: sub sec {
666: my $sec = &EXT('request.course.sec');
667: $sec = '' if $sec eq "";
668: return $sec;
669: }
670:
671: sub open_date {
672: my @dc = split(/\s+/,localtime(&EXT('resource.0.opendate')));
673: return '' if ($dc[0] eq "Wed" and $dc[2] == 31 and $dc[4] == 1969);
674: my @hm = split(/:/,$dc[3]);
675: my $ampm = " am";
676: if ($hm[0] > 12) {
677: $hm[0]-=12;
678: $ampm = " pm";
679: }
680: return $dc[0].', '.$dc[1].' '.$dc[2].', '.$dc[4].' at '.$hm[0].':'.$hm[1].$ampm;
681: }
682:
683: sub due_date {
684: my @dc = split(/\s+/,localtime(&EXT('resource.0.duedate')));
685: return '' if ($dc[0] eq "Wed" and $dc[2] == 31 and $dc[4] == 1969);
686: my @hm = split(/:/,$dc[3]);
687: my $ampm = " am";
688: if ($hm[0] > 12) {
689: $hm[0]-=12;
690: $ampm = " pm";
691: }
692: return $dc[0].', '.$dc[1].' '.$dc[2].', '.$dc[4].' at '.$hm[0].':'.$hm[1].$ampm;
693: # return $dc[0].', '.$dc[1].' '.$dc[2].', '.$dc[4].' at '.$dc[3];
694: }
695:
696: sub answer_date {
697: my @dc = split(/\s+/,localtime(&EXT('resource.0.answerdate')));
698: return '' if ($dc[0] eq "Wed" and $dc[2] == 31 and $dc[4] == 1969);
699: my @hm = split(/:/,$dc[3]);
700: my $ampm = " am";
701: if ($hm[0] > 12) {
702: $hm[0]-=12;
703: $ampm = " pm";
704: }
705: return $dc[0].', '.$dc[1].' '.$dc[2].', '.$dc[4].' at '.$hm[0].':'.$hm[1].$ampm;
706: # return $dc[0].', '.$dc[1].' '.$dc[2].', '.$dc[4].' at '.$dc[3];
707: }
708:
709: sub array_moments {
710: my @input=@_;
711: my (@output,$N);
712: $N=scalar (@input);
713: $output[0]=$N;
714: if ($N <= 1) {
715: $output[1]=$input[0];
716: $output[1]="Input array not defined" if ($N == 0);
717: $output[2]="variance undefined for N<=1";
718: $output[3]="skewness undefined for N<=1";
719: $output[4]="kurtosis undefined for N<=1";
720: return @output;
721: }
722: my $sum=0;
723: foreach my $line (@input) {
724: $sum+=$line;
725: }
726: $output[1] = $sum/$N;
727: my ($x,$sdev,$var,$skew,$kurt) = 0;
728: foreach my $line (@input) {
729: $x=$line-$output[1];
730: $var+=$x**2;
731: $skew+=$x**3;
732: $kurt+=$x**4;
733: }
734: $output[2]=$var/($N-1);
735: $sdev=CORE::sqrt($output[2]);
736: if ($sdev == 0) {
737: $output[3]="inf-variance=0";
738: $output[4]="inf-variance=0";
739: return @output;
740: }
741: $output[3]=$skew/($sdev**3*$N);
742: $output[4]=$kurt/($sdev**4*$N)-3;
743: return @output;
744: }
745:
746: sub choose {
747: my $num = $_[0];
748: return $_[$num];
749: }
750:
751: # expiremental idea
752: sub proper_path {
753: my ($path)=@_;
754: if ( $external::target eq "tex" ) {
755: return '/home/httpd/html'.$path;
756: } else {
757: return $path;
758: }
759: }
760:
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