--- loncom/homework/default_homework.lcpm	2000/10/12 20:36:05	1.4
+++ loncom/homework/default_homework.lcpm	2000/10/13 14:58:49	1.6
@@ -66,3 +66,32 @@ sub format {
   my ($value,$fmt)=@_;
   $SCRIPT_RESULT.=sprintf('%.'.$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 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";