--- loncom/interface/statistics/lonproblemanalysis.pm	2004/10/04 19:10:26	1.91
+++ loncom/interface/statistics/lonproblemanalysis.pm	2004/10/05 14:03:45	1.93
@@ -1,6 +1,6 @@
 # The LearningOnline Network with CAPA
 #
-# $Id: lonproblemanalysis.pm,v 1.91 2004/10/04 19:10:26 matthew Exp $
+# $Id: lonproblemanalysis.pm,v 1.93 2004/10/05 14:03:45 matthew Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -619,9 +619,9 @@ sub OR_tries_analysis {
         foreach my $foilid (@{$concept->{'foils'}}) {
             for (my $try=$mintries;$try<=$maxtries;$try++) {
                 # concept analysis data
-                $concept_data[$j]->{'_correct'} +=
+                $concept_data[$j]->[$try]->{'_correct'} +=
                     $response_data{$foilid}->[$try]->{'_correct'};
-                $concept_data[$j]->{'_total'} +=
+                $concept_data[$j]->[$try]->{'_total'} +=
                     $response_data{$foilid}->[$try]->{'_total'};
                 #
                 # foil analysis data
@@ -663,19 +663,32 @@ sub OR_tries_analysis {
     if (defined($Concepts)) { $num_concepts = scalar(@$Concepts); }
     #
     for (my $try=$mintries;$try<=$maxtries;$try++) {
+        if (! defined($response_data{'_total'}->[$try]) ||
+            $response_data{'_total'}->[$try] == 0) { 
+            if ($try > 1) {
+                $analysis_html.= '<tr><td align="center" colspan="4"><b>'.
+                    &mt('None of the selected students attempted the problem more than [_1] times.',$try-1).
+                    '</b></td></tr>';
+            } else {
+                $analysis_html.= '<tr><td colspan="4" align="center"><b>'.
+                    &mt('None of the selected students have attempted the problem').'</b></td></tr>';
+            }
+            last;
+        }
         my $concept_graph='';
         if ($num_concepts > 1) {
             #
             # Create concept plot
             my @concept_plot_data;
             for (my $j=0;$j<=$#concept_data;$j++) {
-                my $total = $concept_data[$j]->{'_total'};
+                my $total = $concept_data[$j]->[$try]->{'_total'};
                 if ($total == 0) {
                     $concept_plot_data[$j] = 0;
                 } else {
                     $concept_plot_data[$j] = 100 * 
                         sprintf('%0.3f',
-                                $concept_data[$j]->{'_correct'} / $total);
+                                $concept_data[$j]->[$try]->{'_correct'} / 
+                                $total);
                 }
             }
             #