--- loncom/interface/statistics/lonproblemanalysis.pm	2003/10/10 21:45:34	1.31
+++ loncom/interface/statistics/lonproblemanalysis.pm	2003/10/14 22:02:49	1.38
@@ -1,6 +1,7 @@
 # The LearningOnline Network with CAPA
 #
-# $Id: lonproblemanalysis.pm,v 1.31 2003/10/10 21:45:34 matthew Exp $
+
+# $Id: lonproblemanalysis.pm,v 1.38 2003/10/14 22:02:49 matthew Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -34,6 +35,7 @@ use Apache::lonhtmlcommon();
 use Apache::loncoursedata();
 use Apache::lonstatistics;
 use Apache::lonlocal;
+use HTML::Entities();
 
 sub BuildProblemAnalysisPage {
     my ($r,$c)=@_;
@@ -42,13 +44,27 @@ sub BuildProblemAnalysisPage {
     #
     my @Students = @Apache::lonstatistics::Students;
     #
-    if (exists($ENV{'form.problemchoice'}) && !exists($ENV{'SelectAnother'})) {
+    if (exists($ENV{'form.updatecaches'}) ||
+        (exists($ENV{'form.firstanalysis'}) &&
+         $ENV{'form.firstanalysis'} ne 'no')) {
+        &Apache::lonstatistics::Gather_Full_Student_Data($r);
+    }
+    if (! exists($ENV{'form.firstanalysis'})) {
+        $r->print('<input type="hidden" name="firstanalysis" value="yes" />');
+    } else {
+        $r->print('<input type="hidden" name="firstanalysis" value="no" />');
+    }
+    if (exists($ENV{'form.problemchoice'}) && 
+        ! exists($ENV{'form.SelectAnother'})) {
         $r->print('<input type="submit" name="ProblemAnalysis" value="'.
                   &mt('Analyze Problem Again').'" />');
         $r->print('&nbsp;'x5);
         $r->print('<input type="submit" name="ClearCache" value="'.
                   &mt('Clear Caches').'" />');
         $r->print('&nbsp;'x5);
+        $r->print('<input type="submit" name="updatecaches" value="'.
+                  &mt('Update Student Data').'" />');
+        $r->print('&nbsp;'x5);
         $r->print('<input type="hidden" name="problemchoice" value="'.
                   $ENV{'form.problemchoice'}.'" />');
         $r->print('<input type="submit" name="SelectAnother" value="'.
@@ -56,7 +72,6 @@ sub BuildProblemAnalysisPage {
         $r->print('&nbsp;'x5);
         #
         $r->print('<hr />');
-        &Apache::lonstatistics::Gather_Full_Student_Data($r);
         #
         my ($symb,$part,$resid) = &get_problem_symb(
                      &Apache::lonnet::unescape($ENV{'form.problemchoice'})
@@ -86,14 +101,14 @@ sub BuildProblemAnalysisPage {
                                            (\@Students,$symb,$resid);
             if (defined($PerformanceData) && 
                 ref($PerformanceData) eq 'ARRAY') {
-                if ($ENV{'form.AnalyzeBy'} eq 'Tries') {
-                    my $analysis_html = &DoTriesAnalysis($PerformanceData,
+                if ($ENV{'form.AnalyzeOver'} eq 'Tries') {
+                    my $analysis_html = &tries_analysis($PerformanceData,
+                                                         $ORdata);
+                    $r->print($analysis_html);
+                } elsif ($ENV{'form.AnalyzeOver'} eq 'Time') {
+                    my $analysis_html = &time_analysis($PerformanceData,
                                                          $ORdata);
                 $r->print($analysis_html);
-#                } elsif ($ENV{'form.AnalyzeBy'} eq 'Time') {
-#                    my $analysis_html = &DoTimeAnalysis($PerformanceData,
-#                                                         $ORdata);
-#                $r->print($analysis_html);
                 } else {
                     $r->print('<h2>'.
                               &mt('The analysis you have selected is '.
@@ -119,53 +134,158 @@ sub BuildProblemAnalysisPage {
 }
 
 
-sub DoTriesAnalysis {
-    my ($PerformanceData,$ORdata) = @_;
-    my $mintries = 1;
-    my $maxtries = $ENV{'form.NumPlots'};
-    my %ResponseData = &analyze_option_data_by_tries($PerformanceData,
-                                                 $mintries,$maxtries);
-    my @Foils = sort(keys(%ResponseData));
-    my %Row_Label;
+#########################################################
+#########################################################
+##
+##      Misc interface routines use by analysis code
+##
+#########################################################
+#########################################################
+sub build_foil_index {
+    my ($ORdata) = @_;
+    my %Foildata = %{$ORdata->{'Foils'}};
+    my @Foils = sort(keys(%Foildata));
+    my %Concepts;
     foreach my $foilid (@Foils) {
-        my $value = $ORdata->{'Foiltext'}->{$foilid};
-        $Row_Label{$foilid} = $ORdata->{'Foiltext'}->{$foilid};
+        push(@{$Concepts{$Foildata{$foilid}->{'Concept'}}},
+             $foilid);
+    }
+    undef(@Foils);
+    # Having gathered the concept information in a hash, we now translate it
+    # into an array because we need to be consistent about order.
+    # Also put the foils in order, too.
+    my $sortfunction = sub {
+        my %Numbers = (one   => 1,
+                       two   => 2,
+                       three => 3,
+                       four  => 4,
+                       five  => 5,
+                       six   => 6,
+                       seven => 7,
+                       eight => 8,
+                       nine  => 9,
+                       ten   => 10,);
+        my $a1 = $a; 
+        my $b1 = $b;
+        if (exists($Numbers{$a})) {
+            $a1 = $Numbers{$a};
+        }
+        if (exists($Numbers{$b})) {
+            $b1 = $Numbers{$b};
+        }
+        $a1 cmp $b1;
+    };
+    my @Concepts;
+    foreach my $concept (sort $sortfunction (keys(%Concepts))) {
+        push(@Concepts,{name => $concept,
+                        foils => [@{$Concepts{$concept}}]});
+        push(@Foils,(@{$Concepts{$concept}}));
     }
     #
     # Build up the table of row labels.
-    my @Rows;
-    $Rows[0]= [ '<th>'.&mt('Foil Number').'</th>', 
-                '<th>'.&mt('Foil Text').'</td>'];
     my $table = '<table border="1" >'."\n";
-    my $index = 1;
-    foreach my $foilid (@Foils) {
-        $table .= '<tr><td>'.$index.'</td>'.
-            '<td>'.$Row_Label{$foilid}."</td></tr>\n";
+    $table .= '<tr>'.
+        '<th>'.&mt('Concept Number').'</th>'.
+        '<th>'.&mt('Concept').'</th>'.
+        '<th>'.&mt('Foil Number').'</th>'.
+        '<th>'.&mt('Foil Name').'</th>'.
+        '<th>'.&mt('Foil Text').'</th>'.
+        '<th>'.&mt('Correct Value').'</th>'.
+        "</tr>\n";
+    my $conceptindex = 1;
+    my $foilindex = 1;
+    foreach my $concept (@Concepts) {
+        my @FoilsInConcept = @{$concept->{'foils'}};
+        my $firstfoil = shift(@FoilsInConcept);
+        $table .= '<tr>'.
+            '<td>'.$conceptindex.'</td>'.
+            '<td>'.$concept->{'name'}.'</td>'.
+            '<td>'.$foilindex++.'</td>'.
+            '<td>'.$Foildata{$firstfoil}->{'name'}.'</td>'.
+            '<td>'.$Foildata{$firstfoil}->{'text'}.'</td>'.
+            '<td>'.$Foildata{$firstfoil}->{'value'}.'</td>'.
+            "</tr>\n";
+        foreach my $foilid (@FoilsInConcept) {
+            $table .= '<tr>'.
+                '<td></td>'.
+                '<td></td>'.
+                '<td>'.$foilindex.'</td>'.
+                '<td>'.$Foildata{$foilid}->{'name'}.'</td>'.
+                '<td>'.$Foildata{$foilid}->{'text'}.'</td>'.
+                '<td>'.$Foildata{$foilid}->{'value'}.'</td>'.
+                "</tr>\n";
+        } continue {
+            $foilindex++;
+        }
     } continue {
-        $index++;
+        $conceptindex++;
     }
     $table .= "</table>\n";
+    return ($table,\@Foils,\@Concepts);
+}
+
+#########################################################
+#########################################################
+##
+##         Tries Analysis
+##
+#########################################################
+#########################################################
+sub tries_analysis {
+    my ($PerformanceData,$ORdata) = @_;
+    my $mintries = 1;
+    my $maxtries = $ENV{'form.NumPlots'};
+    my %ResponseData = &analyze_option_data_by_tries($PerformanceData,
+                                                     $mintries,$maxtries);
+    my ($table,$Foils,$Concepts) = &build_foil_index($ORdata);
     #
     # Compute the data neccessary to make the plots
     my @PlotData;
-    my @CumulativePlotData;
-    foreach my $foilid (@Foils) {
-        for (my $i=$mintries;$i<=$maxtries;$i++) {
-            #
-            # Gather the per-attempt data
-            push (@{$PlotData[$i]->{'good'}},
-                  $ResponseData{$foilid}->[$i]->{'percent_corr'});
-            push (@{$PlotData[$i]->{'bad'}},
-                  100-$ResponseData{$foilid}->[$i]->{'percent_corr'});
-            #
-            # Someday we may need the cumulative data and I think
-            # this is a neat way of computing it as we go along.
-            push (@{$CumulativePlotData[$i]->{'good'}},
-                  $CumulativePlotData[-1]->{'good'}+
-                  $ResponseData{$foilid}->[$i]->{'correct'});
-            push (@{$CumulativePlotData[$i]->{'bad'}},
-                  $CumulativePlotData[-1]->{'bad'}+
-                  $ResponseData{$foilid}->[$i]->{'incorrect'});
+    my $xlabel;
+    if ($ENV{'form.AnalyzeAs'} eq 'Foils') {
+        $xlabel = 'Foil Number';
+        foreach my $foilid (@$Foils) {
+            for (my $i=$mintries;$i<=$maxtries;$i++) {
+                #
+                # Gather the per-attempt data
+                my $percent;
+                if ($ResponseData{$foilid}->[$i]->{'total'} == 0) {
+                    $percent = 0;
+                } else {
+                    $percent = $ResponseData{$foilid}->[$i]->{'correct'} /
+                        $ResponseData{$foilid}->[$i]->{'total'};
+                }
+                push (@{$PlotData[$i]->{'total'}},
+                                 $ResponseData{$foilid}->[$i]->{'total'});
+                push (@{$PlotData[$i]->{'good'}},100 * $percent);
+                push (@{$PlotData[$i]->{'bad'}}, 100 *(1-$percent));
+            }
+        }
+    } else {
+        # Concept analysis
+        $xlabel = 'Concept Number';
+        foreach my $concept (@$Concepts) {
+            for (my $i=$mintries;$i<=$maxtries;$i++) {
+                #
+                # Gather the per-attempt data
+                my ($correct,$incorrect,$total);
+                foreach my $foil (@{$concept->{'foils'}}) {
+                    $correct   += $ResponseData{$foil}->[$i]->{'correct'};
+                    $incorrect += $ResponseData{$foil}->[$i]->{'incorrect'};
+                    $total     += $ResponseData{$foil}->[$i]->{'total'};
+                }
+                push (@{$PlotData[$i]->{'correct'}},  $correct);
+                push (@{$PlotData[$i]->{'incorrect'}},$incorrect);
+                push (@{$PlotData[$i]->{'total'}},    $total);
+                my $percent;
+                if ($total == 0) {
+                    $percent = 0;
+                } else {
+                    $percent = $correct/$total;
+                }
+                push (@{$PlotData[$i]->{'good'}},100*$percent);
+                push (@{$PlotData[$i]->{'bad'}},100*(1-$percent));
+            }
         }
     }
     # 
@@ -173,37 +293,30 @@ sub DoTriesAnalysis {
     $table .= "<table>\n";
     my @Plots;
     for (my $i=$mintries;$i<=$maxtries;$i++) {
-        my $minstu = $ResponseData{$Foils[0]}->[$i]->{'total'};
-        my $maxstu = $ResponseData{$Foils[0]}->[$i]->{'total'};
-        foreach my $foilid (@Foils) {
-            if ($minstu > $ResponseData{$foilid}->[$i]->{'total'}) {
-                $minstu = $ResponseData{$foilid}->[$i]->{'total'};
+        my $minstu = $PlotData[$i]->{'total'}->[0];
+        my $maxstu = $PlotData[$i]->{'total'}->[0];
+        foreach my $count (@{$PlotData[$i]->{'total'}}) {
+            if ($minstu > $count) {
+                $minstu = $count;
             }
-            if ($maxstu < $ResponseData{$foilid}->[$i]->{'total'}) {
-                $maxstu = $ResponseData{$foilid}->[$i]->{'total'};
+            if ($maxstu < $count) {
+                $maxstu = $count;
             }
         }
         $maxstu = 0 if (! $maxstu);
         $minstu = 0 if (! $minstu);
-        my $graphlink;
+        my $title;
         if ($maxstu == $minstu) {
-            $graphlink = &Apache::loncommon::DrawGraph
-                ('Attempt '.$i.', '.$maxstu.' students',
-                 'Foil Number',
-                 'Percent Correct',
-                 100,
-                 $PlotData[$i]->{'good'},
-                 $PlotData[$i]->{'bad'});
+            $title = 'Attempt '.$i.', '.$maxstu.' students';
         } else {
-            $graphlink = &Apache::loncommon::DrawGraph
-                ('Attempt '.$i.', '.$minstu.'-'.$maxstu.
-                 ' students',
-                 'Foil Number',
-                 'Percent Correct',
-                 100,
-                 $PlotData[$i]->{'good'},
-                 $PlotData[$i]->{'bad'});
+            $title = 'Attempt '.$i.', '.$minstu.'-'.$maxstu.' students';
         }
+        my $graphlink = &Apache::loncommon::DrawGraph($title,
+                                                      $xlabel,
+                                                      'Percent Correct',
+                                                      100,
+                                                      $PlotData[$i]->{'good'},
+                                                      $PlotData[$i]->{'bad'});
         push(@Plots,$graphlink);
     }
     #
@@ -254,27 +367,170 @@ sub analyze_option_data_by_tries {
                      ($tryhash->{'correct'} < 1 &&
                       $tryhash->{'incorrect'} < 1));
             $tryhash->{'total'} = $tryhash->{'correct'} + 
-                                        $tryhash->{'incorrect'};
-            $tryhash->{'percent_corr'} = 100 *
-                ($tryhash->{'correct'} /
-                         ($tryhash->{'correct'} + $tryhash->{'incorrect'})
-                 );
+                $tryhash->{'incorrect'};
         }
     }
     return %Trydata;
 }
 
-sub get_problem_symb {
-    my $problemstring = shift();
-    my ($symb,$partid,$resid) = ($problemstring=~ /^(.*):([^:]*):([^:]*)$/);
-    return ($symb,$partid,$resid);
+#########################################################
+#########################################################
+##
+##                 Time Analysis
+##
+#########################################################
+#########################################################
+sub time_analysis {
+    my ($PerformanceData,$ORdata) = @_;
+    my $num_plots = $ENV{'form.NumPlots'};
+    my ($table,$Foils,$Concepts) = &build_foil_index($ORdata);
+    my $num_data = scalar(@$PerformanceData)-1;
+    my $percent = sprintf('%2f',100/$num_plots);
+    $table .= "<table>\n";
+    for (my $i=0;$i<$num_plots;$i++) {
+        my $starttime = &Apache::lonhtmlcommon::get_date_from_form
+            ('startdate_'.$i);
+        my $endtime = &Apache::lonhtmlcommon::get_date_from_form
+            ('enddate_'.$i);
+        my ($begin_index,$end_index,$plottitle,$plothtml,$data);
+        if (! defined($starttime) || ! defined($endtime)) {
+            $begin_index = $i*int($num_data/$num_plots);
+            $end_index = ($i+1)*int($num_data/$num_plots);
+            my $lownum  = sprintf('%2.1f',$i*$percent);
+            $lownum =~ s/(\.0)$//;
+            my $highnum = sprintf('%2.1f',($i+1)*$percent);
+            $highnum =~ s/(\.0)$//;
+            $plottitle = $lownum.'% to '.$highnum.'% of submissions';
+        } else {
+            my $j;
+            while (++$j < scalar(@$PerformanceData)) {
+                last if ($PerformanceData->[$j]->[2] > $starttime);
+            }
+            $begin_index = $j;
+            while (++$j < scalar(@$PerformanceData)) {
+                last if ($PerformanceData->[$j]->[2] > $endtime);
+            }
+            $end_index = $j;
+            $plottitle = $ENV{'form.plottitle_'.$i};
+        }
+        ($plothtml,$starttime,$endtime,$data) = 
+            &analyze_option_data_by_time($PerformanceData,
+                                         $begin_index,$end_index,
+                                         $plottitle,
+                                         @$Concepts);
+        my $startdateform = &Apache::lonhtmlcommon::date_setter
+            ('Statistics','startdate_'.$i,$starttime);
+        my $enddateform = &Apache::lonhtmlcommon::date_setter
+            ('Statistics','enddate_'.$i,$endtime);
+        $table.="<tr><td>".$plothtml.'</td><td align="left" valign="top">'.
+            "<b>Start Time</b>: &nbsp;".$startdateform."<br />".
+            "<b>End Time</b>&nbsp;&nbsp;: "."&nbsp;".$enddateform."<br />".
+            '<b>Plot Title</b>&nbsp;&nbsp;:'.("&nbsp;"x3).
+            '<input type="text" size="30" name="plottitle_'.$i.'" value="'.
+                  &HTML::Entities::encode($plottitle).'" /><br />'.
+            "</td></tr>\n";
+    }
+    $table .="</table>\n";
+    return $table;
 }
 
+sub analyze_option_data_by_time {
+    my ($PerformanceData,$begin_index,$end_index,$description,@Concepts) = @_;
+    my %TimeData;
+    #
+    # Get the start and end times for this segment of the plot
+    my $starttime = $PerformanceData->[$begin_index]->[2];
+    my $endtime   = $PerformanceData->[$end_index  ]->[2];
+    #
+    # Compute the number getting the foils correct or incorrects
+    for (my $i=$begin_index;$i<=$end_index;$i++) {
+        my $row = $PerformanceData->[$i];
+        next if (! defined($row));
+        my ($grading,$submission,$time,$tries) = @$row;
+        my @Foilgrades = split('&',$grading);
+        my @Foilsubs   = split('&',$submission);
+        foreach my $foilgrade (@Foilgrades) {
+            my ($foilid,$correct) = split('=',$foilgrade);
+            if ($correct) {
+                $TimeData{$foilid}->{'correct'}++;
+            } else {
+                $TimeData{$foilid}->{'incorrect'}++;
+            }
+        }
+    }
+    #
+    # Compute the total and percent correct
+    my @Plotdata1;
+    my @Plotdata2;
+    foreach my $concept (@Concepts) {
+        my ($correct,$incorrect,$total);
+        foreach my $foilid (@{$concept->{'foils'}}) {
+            if (! exists($TimeData{$foilid}->{'correct'})) {
+                $TimeData{$foilid}->{'correct'} = 0;
+            }
+            if (! exists($TimeData{$foilid}->{'incorrect'})) {
+                $incorrect = 0;
+                $TimeData{$foilid}->{'incorrect'} = 0;
+            }
+            $correct   += $TimeData{$foilid}->{'correct'};
+            $incorrect += $TimeData{$foilid}->{'incorrect'};
+            $total     += $TimeData{$foilid}->{'correct'}+
+                $TimeData{$foilid}->{'incorrect'};
+            $TimeData{$foilid}->{'total'} = $TimeData{$foilid}->{'correct'} +
+                $TimeData{$foilid}->{'incorrect'};
+            my $percent;
+            if ($TimeData{$foilid}->{'total'} == 0) {
+                $percent = 0;
+            } else {
+                $percent = $TimeData{$foilid}->{'correct'} / 
+                    $TimeData{$foilid}->{'total'};
+            }
+            $TimeData{$foilid}->{'percent_corr'} = 100 * $percent;
+            if ($ENV{'form.AnalyzeAs'} eq 'Foils') {
+                push (@Plotdata1,    $TimeData{$foilid}->{'percent_corr'});
+                push (@Plotdata2,100-$TimeData{$foilid}->{'percent_corr'});
+            }
+        }
+        if ($ENV{'form.AnalyzeAs'} ne 'Foils') {
+            if ($total == 0) {
+                push (@Plotdata1,0);
+                push (@Plotdata2,100);
+            } else {
+                push (@Plotdata1,100 *   $correct / $total);
+                push (@Plotdata2,100 * (1-$correct / $total));
+            }
+        }
+    }
+    #
+    # Create the plot
+    my $xlabel;
+    if ($ENV{'form.AnalyzeAs'} eq 'Foils') {
+        $xlabel = 'Foil Number';
+    } else {
+        $xlabel = 'Concept Number';
+    }
+    my $graphlink = &Apache::loncommon::DrawGraph
+        ($description,#'Time Interval Analysis',
+         $xlabel,
+         'Percent Correct / Incorrect',
+         100,
+         \@Plotdata1,\@Plotdata2);
+    #
+    return ($graphlink,$starttime,$endtime,\%TimeData);
+}
+
+#########################################################
+#########################################################
+##
+##             Interface 
+##
+#########################################################
+#########################################################
 sub CreateInterface {
     ##
     ## Environment variable initialization
-    if (! exists$ENV{'form.AnalyzeBy'}) {
-        $ENV{'form.AnalyzeBy'} = 'Tries';
+    if (! exists$ENV{'form.AnalyzeOver'}) {
+        $ENV{'form.AnalyzeOver'} = 'Tries';
     }
     ##
     ## Build the menu
@@ -307,39 +563,59 @@ sub CreateInterface {
     };
     &Apache::lonstatistics::MapSelect('Maps','multiple,all',5,
                                               $only_seq_with_assessments);
-#    $Str .= '</td>';
-    #
+    ##
+    ##
     $Str .= '<td>';
-    $Str .= '<nobr>'.&mt('Analyze By ');
-    $Str .='<select name="AnalyzeBy" >';
-    #
-    $Str .= '<option value="Tries" ';
-    if (! exists($ENV{'form.AnalyzeBy'}) || $ENV{'form.AnalyzeBy'} eq 'Tries'){
-        # Default to Tries
-        $Str .= ' selected ';
-    }
-    $Str .= '>'.&mt('Tries').'</option>';
-    #
-    $Str .= '<option value="Time" ';
-    $Str .= ' selected ' if ($ENV{'form.AnalyzeBy'} eq 'Time');
-    $Str .= '>'.&mt('Time').'</option>';
-    $Str .= '</select></nobr><br />';
-    #
-    $Str .= '<br /><nobr>'.&mt('Number of Plots:');
-    $Str .= '<select name="NumPlots">';
-    if (! exists($ENV{'form.NumPlots'}) 
-        || $ENV{'form.NumPlots'} < 1 
-        || $ENV{'form.NumPlots'} > 20) {
-        $ENV{'form.NumPlots'} = 7;
-    }
-    foreach my $i (1,2,3,4,5,6,7,8,10,15,20) {
-        $Str .= '<option value="'.$i.'" ';
-        if ($ENV{'form.NumPlots'} == $i) { $Str.=' selected '; }
-        $Str .= '>'.$i.'</option>';
+    { # These braces are here to organize the code, not scope it.
+        {
+            $Str .= '<nobr>'.&mt('Analyze Over ');
+            $Str .='<select name="AnalyzeOver" >';
+            $Str .= '<option value="Tries" ';
+            if (! exists($ENV{'form.AnalyzeOver'}) || 
+                $ENV{'form.AnalyzeOver'} eq 'Tries'){
+                # Default to Tries
+                $Str .= ' selected ';
+            }
+            $Str .= '>'.&mt('Tries').'</option>';
+            $Str .= '<option value="Time" ';
+            $Str .= ' selected ' if ($ENV{'form.AnalyzeOver'} eq 'Time');
+            $Str .= '>'.&mt('Time').'</option>';
+            $Str .= '</select></nobr><br />';
+        }
+        {
+            $Str .= '<nobr>'.&mt('Analyze as ');
+            $Str .='<select name="AnalyzeAs" >';
+            $Str .= '<option value="Concepts" ';
+            if (! exists($ENV{'form.AnalyzeAs'}) || 
+                $ENV{'form.AnalyzeAs'} eq 'Concepts'){
+                # Default to Concepts
+                $Str .= ' selected ';
+            }
+            $Str .= '>'.&mt('Concepts').'</option>';
+            $Str .= '<option value="Foils" ';
+            $Str .= ' selected ' if ($ENV{'form.AnalyzeAs'} eq 'Foils');
+            $Str .= '>'.&mt('Foils').'</option>';
+            $Str .= '</select></nobr><br />';
+        }
+        {
+            $Str .= '<br /><nobr>'.&mt('Number of Plots:');
+            $Str .= '<select name="NumPlots">';
+            if (! exists($ENV{'form.NumPlots'}) 
+                || $ENV{'form.NumPlots'} < 1 
+                || $ENV{'form.NumPlots'} > 20) {
+                $ENV{'form.NumPlots'} = 5;
+            }
+            foreach my $i (1,2,3,4,5,6,7,8,10,15,20) {
+                $Str .= '<option value="'.$i.'" ';
+                if ($ENV{'form.NumPlots'} == $i) { $Str.=' selected '; }
+                $Str .= '>'.$i.'</option>';
+            }
+            $Str .= '</select></nobr>';
+        }
     }
-    $Str .= '</select></nobr>';
     $Str .= '</td>';
-    #
+    ##
+    ##
     $Str .= '</tr>'."\n";
     $Str .= '</table>'."\n";
     return ($Str);
@@ -352,7 +628,6 @@ sub OptionResponseProblemSelector {
         next if ($seq->{'num_assess'}<1);
         my $seq_str = '';
         foreach my $res (@{$seq->{'contents'}}) {
-#            &Apache::lonnet::logthis('checking '.$res->{'title'});
             next if ($res->{'type'} ne 'assessment');
             foreach my $part (@{$res->{'parts'}}) {
                 my $partdata = $res->{'partdata'}->{$part};
@@ -390,6 +665,19 @@ sub OptionResponseProblemSelector {
     return $Str;
 }
 
+#########################################################
+#########################################################
+##
+##              Misc functions
+##
+#########################################################
+#########################################################
+sub get_problem_symb {
+    my $problemstring = shift();
+    my ($symb,$partid,$resid) = ($problemstring=~ /^(.*):([^:]*):([^:]*)$/);
+    return ($symb,$partid,$resid);
+}
+
 sub get_resource_from_symb {
     my ($symb) = @_;
     foreach my $seq (&Apache::lonstatistics::Sequences_with_Assess()) {
@@ -404,18 +692,10 @@ sub get_resource_from_symb {
 
 sub get_problem_data {
     my ($url) = @_;
-#    my $Answ=&Apache::lonnet::ssi($URI,('grade_target' => 'analyze',
-#                                  'grade_username' => $sname,
-#                                  'grade_domain' => $sdom,
-#                                  'grade_courseid' => $cid,
-#                                  'grade_symb' => $symb));
     my $Answ=&Apache::lonnet::ssi($url,('grade_target' => 'analyze'));
     (my $garbage,$Answ)=split(/_HASH_REF__/,$Answ,2);
     my %Answer;
     %Answer=&Apache::lonnet::str2hash($Answ);
-#    &Apache::lonnet::logthis('keys of %Answer = '.join(', ',(keys(%Answer))));
-#    &Apache::lonnet::logthis('$Answer{parts} = '.
-#                             join(', ',@{$Answer{'parts'}}));
     my %Partdata;
     foreach my $part (@{$Answer{'parts'}}) {
         while (my($key,$value) = each(%Answer)) {
@@ -429,45 +709,24 @@ sub get_problem_data {
                 } elsif ($key =~ /^concept\.(.*)$/) {
                     my $concept = $1;
                     foreach my $foil (@$value) {
-                        $Partdata{$part}->{$foil}->{'Concept'}=$concept;
+                        $Partdata{$part}->{'Foils'}->{$foil}->{'Concept'}=
+                                                                      $concept;
                     }
                 }
- #               &Apache::lonnet::logthis($part.' '.$key.' (array) = '.
- #                                        join(', ',@$value));
             } else {
                 $value =~ s/^\s*//g;
                 $value =~ s/\s*$//g;
                 if ($key=~ /^foil\.text\.(.*)$/) {
                     my $foil = $1;
-                    $Partdata{$part}->{'Foiltext'}->{$foil}=$value;
+                    $Partdata{$part}->{'Foils'}->{$foil}->{'name'}=$foil;
+                    $Partdata{$part}->{'Foils'}->{$foil}->{'text'}=$value;
                 } elsif ($key =~ /^foil\.value\.(.*)$/) {
                     my $foil = $1;
-                    $Partdata{$part}->{'FoilValues'}->{$foil}=$value;
+                    $Partdata{$part}->{'Foils'}->{$foil}->{'value'}=$value;
                 }
-#                &Apache::lonnet::logthis($part.' '.$key.' = '.$value);
             }
         }
     }
-
-#    my $parts='';
-#    foreach my $elm (@{$Answer{"parts"}}) {
-#        $parts.="$elm,";
-#    }
-#    chop($parts);
-#    my $conc='';
-#    foreach my $elm (@{$Answer{"$parts.concepts"}}) {
-#        $conc.="$elm@";
-#    }
-#    chop($conc);
-#
-#    @Concepts=split(/\@/,$conc);
-#    foreach my $concept (@{$Answer{"$parts.concepts"}}) {
-#        foreach my $foil (@{$Answer{"$parts.concept.$concept"}}) {
-#            $foil_to_concept{$foil} = $concept;
-#            #$ConceptData{$foil} = $Answer{"$parts.foil.value.$foil"};
-#        }
-#    }
-#    return $symb;
     return %Partdata;
 }