--- loncom/homework/default_homework.lcpm	2000/10/12 21:51:03	1.5
+++ loncom/homework/default_homework.lcpm	2000/10/13 14:58:49	1.6
@@ -70,8 +70,18 @@ sub format {
 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++ ) {
-    ${$_[$i]}=$_[$i+$num]
+    ${$_[$permutation[$i]]}=$_[$i+$num]
   }
 }
 
@@ -79,7 +89,9 @@ sub choose {
   my $num = $_[0];
   return $_[$num];
 }
+#$external::randomseed=time;
 #$a=2;
 #$b=2;
-#&map(1,\$a,\$b,3,4);
+#$c=2;
+#&map(1,\$a,\$b,\$c,3,4,5);
 #print $a."\n".$b."\n";