--- loncom/homework/default_homework.lcpm	2000/10/05 19:24:23	1.2
+++ loncom/homework/default_homework.lcpm	2001/05/30 15:24:53	1.22
@@ -2,27 +2,209 @@
 # used by lonxml::xmlparse() as input variable $safeinit to Apache::run::run()
 # 
 #
+#init some globals
+#
+# Guy Albertelli
+#
+# 05/25/2001 H. K. Ng
+#
+$RANDOMINIT=0;
+$pi=atan2(1,1)*4;
+$rad2deg=180.0/$pi;
+$deg2rad=$pi/180.0;
+
+sub caparesponse_check {
+  my $answer='';  #done
+  my $type='';    #done
+  my $tol_type=''; # gets it's value from whether tol has a % or not done
+  my $tol='';     #done
+  my $sig='';     #done lowerbnd,upperbnd
+  my $sig_lbound=''; #done
+  my $sig_ubound=''; #done
+  my $ans_fmt='';
+  my $units='';     #done
+  my $calc='';
+  my ($response,$expr)=@_;
+  
+  ($answer,$type,$tol,$sig,$ans_fmt,
+   $units,$calc) = eval $expr.';return $answer,$type,$tol,$sig,$ans_fmt,$units,$calc';
+  #type's definitons come from capaParser.h
+  if ($type eq '' ) {
+    if ( $answer eq ($answer *1.0)) { $type = 2;
+    } else { $type = 3; }
+  } else {
+         if ($type eq 'cs')    { $type = 4;
+    } elsif ($type eq 'ci')    { $type = 3;
+    } elsif ($type eq 'mc')    { $type = 5;
+    } elsif ($type eq 'fml')   { $type = 8;
+    } elsif ($type eq 'subj')  { $type = 7;
+    } else { return "ERROR: Unknown type of answer: $type" }
+  }
+
+  if ($tol eq '') {
+    $tol=0.0;
+    $tol_type=1; #TOL_ABSOLUTE
+  } else {
+    if ($tol =~ /%$/) {
+      chop $tol;
+      $tol_type=2; #TOL_PERCENTAGE
+    } else {
+      $tol_type=1; #TOL_ABSOLUTE
+    }
+  }
+
+  if ($sig eq '') {
+    $sig_lbound = 0; #SIG_LB_DEFAULT
+    $sig_ubound =15; #SIG_UB_DEFAULT
+  } else {
+    ($sig_lbound,$sig_ubound) = split /,/,$sig;
+  }
+  my $result = &caparesponse_capa_check_answer($response,$answer,$type,
+					       $tol_type,$tol,
+					       $sig_lbound,$sig_ubound,
+					       $ans_fmt,$units,$calc);
+
+  if    ($result == '1') { $result='EXACT_ANS'; } 
+  elsif ($result == '2') { $result='APPROX_ANS'; }
+  elsif ($result == '3') { $result='SIG_FAIL'; }
+  elsif ($result == '4') { $result='UNIT_FAIL'; }
+  elsif ($result == '5') { $result='NO_UNIT'; }
+  elsif ($result == '6') { $result='UNIT_OK'; }
+  elsif ($result == '7') { $result='INCORRECT'; }
+  elsif ($result == '8') { $result='UNIT_NOTNEEDED'; }
+  elsif ($result == '9') { $result='ANS_CNT_NOT_MATCH'; }
+  elsif ($result =='10') { $result='SUB_RECORDED'; }
+  elsif ($result =='11') { $result='BAD_FORMULA'; }
+  elsif ($result =='12') { $result='WANTED_NUMERIC'; }
+  else  {$result = "ERROR: Unknown Result:$result:$@:";}
+
+  return "$result:<br />Error $error:<br />Answer $answer:<br />Response $response:<br />$type|$tol|$tol_type|$sig:$sig_lbound:$sig_ubound|$units<br />";
+}
+
+sub caparesponse_check_list {
+  my ($response,$expr)=@_;
+  my $result='';
+  my $aresult='';
+  my $current_answer;
+  my $answer = eval $expr.';return $answer';
+  my (@list) = eval $answer;
+  my (@responselist)=split /,/,$response;
+  my $unit='';
+  $result.="Final response :$responselist['-1']:<br />";
+  if ( $responselist['-1']=~ /(.*[^\s])\s+([^\s]+)/ ) {
+    $responselist['-1']=$1;
+    $unit=$2;
+  }
+  $result.="Final response :$responselist['-1']:<br />";
+  $unit=~s/\s//;
+  my $i=0;
+  my $awards='';
+  for ($i=0; $i<@list;$i++) {
+    if ($unit eq '') {
+      $aresult=&caparesponse_check($responselist[$i],
+			     $expr.';my $answer='.$list[$i].';');
+    } else {
+      $aresult=&caparesponse_check($responselist[$i]." $unit",
+				   $expr.';my $answer='.$list[$i].';');
+    }
+    my ($temp)=split /:/, $aresult;
+    $awards.="$temp,";
+    $result.=$aresult;
+  }
+  chop $awards;
+  return "$awards:<br />$result";
+}
+
+sub tex {
+  if ( $external::target eq "tex" ) {
+    return @_[0];
+  } else {
+    return @_[1];
+  }
+}
+
+sub web {
+  if ( $external::target eq "tex" ) {
+    return @_[1];
+  } else {
+    if ( $external::target eq "web") {
+      return @_[0];
+    } else {
+      return @_[2];
+    }
+  }
+}
+
+sub problem {
+  return '1';
+}
+
 sub hinton {
   return 0;
 }
 
 sub random {
   my ($start,$end,$step)=@_;
+  if ( ! $RANDOMINIT ) { srand($external::randomseed); $RANDOMINIT=1; }
   my $num=1+int(($end-$start)/$step);
   my $result=$start + int(rand() * $num)*$step;
   return $result;
 }
 
 sub tan  { sin($_[0]) / cos($_[0]) }
-sub acos { atan2(sqrt(1 - $_[0] * $_[0]), $_[0] ); }
-sub asin { atan2($_[0], sqrt(1- $_[0] * $_[0]) );  }
+#sub atan { atan2($_[0], 1); }
+#sub acos { atan2(sqrt(1 - $_[0] * $_[0]), $_[0] ); }
+#sub asin { atan2($_[0], sqrt(1- $_[0] * $_[0]) );  }
+
+sub log10 { log($_[0])/log(10); }
+
+sub factorial {
+    my $input = int(shift);
+    return "Error - unable to take factorial of an negative number ($input)" if $input < 0;
+    return "Error - factorial result is greater than system limit ($input)" if $input > 170;
+    return 1 if $input == 0;
+    my $result = 1; 
+    for (my $i=2; $i<=$input; $i++) { $result *= $i }
+    return $result;
+}
+
+sub sgn {
+    return -1 if $_[0] < 0;
+    return 0 if $_[0] == 0;
+    return 1 if $_[0] > 0;
+}
+
+sub min {
+    my @sorted = sort { $a <=> $b || $a cmp $b } @_;
+    return shift @sorted;
+}
+
+sub max {
+    my @sorted = sort { $a <=> $b || $a cmp $b } @_;
+    return pop @sorted;
+}
 
 sub html {
-  if ( $external::target == "web" ) {
-    $SCRIPT_RESULT.=@_[0];
+  if ( $external::target eq "web" ) {
+    return @_[0];
   }
 }
 
+sub roundto {
+    my ($input,$n) = @_;
+    return sprintf('%.'.$n.'f',$input);
+}
+
+sub to_string {
+    my ($input,$n) = @_;
+    return sprintf('%'.$n,$input) if $n ne "";
+    return sprintf($input) if $n eq "";
+}
+
+sub sub_string {
+    my ($str,$start,$len) = @_;
+    return substr($str,$start-1,$len);
+}
 
 sub pow   {return $_[0] ** $_[1]; }
 sub ceil  {return (($_[0]-int($_[0]))== 0.0) ? $_[0] : (int($_[0])+ 1); }
@@ -30,5 +212,62 @@ sub floor {return int($_[0]);  }
 
 sub format {
   my ($value,$fmt)=@_;
-  $SCRIPT_RESULT.=sprintf('%.'.$fmt,$value);
+  return sprintf('%.'.$fmt,$value);
+}
+
+sub map {
+  my $num = $#_/2;
+  my $i;
+  my @used;
+  my @permutation;
+  for ($i=0; $i < $num;) {
+    $rand = &random(1,$num,1);
+    if ( $used[$rand] == '0' ) {
+      $i++;
+      $used[$rand]='1';
+      $permutation[$i]=$rand;
+    }
+  }
+  for ( $i=1 ; $i<$num+1 ; $i++ ) {
+    ${$_[$permutation[$i]]}=$_[$i+$num]
+  }
+}
+
+sub name{
+  my $fullname = &EXT('environment.lastname').', '.&EXT('environment.firstname').' '.&EXT('environment.middlename');
+  $fullname = "" if $fullname eq ",  ";
+  return $fullname;
+}
+
+sub student_number { 
+  my $id = &EXT('environment.id');
+  $id = '' if $id eq "";
+  return $id;
+}
+
+sub class {
+  my $course = &EXT('course.description');
+  $course = '' if $course eq "";
+  return $course;
+}
+
+sub sec { 
+  my $sec = &EXT('request.course.sec');
+  $sec = '' if $sec eq '';
+  return $sec;
+}
+
+sub open_date { &EXT('resource.0.opendate') }
+sub due_date { &EXT('resource.0.duedate') }
+sub answer_date { &EXT('resource.0.answerdate') }
+
+sub choose {
+  my $num = $_[0];
+  return $_[$num];
 }
+#$external::randomseed=time;
+#$a=2;
+#$b=2;
+#$c=2;
+#&map(1,\$a,\$b,\$c,3,4,5);
+#print $a."\n".$b."\n";