--- loncom/interface/statistics/lonproblemstatistics.pm	2002/08/14 13:13:37	1.24
+++ loncom/interface/statistics/lonproblemstatistics.pm	2002/08/14 17:45:19	1.26
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # (Publication Handler
 #
-# $Id: lonproblemstatistics.pm,v 1.24 2002/08/14 13:13:37 stredwic Exp $
+# $Id: lonproblemstatistics.pm,v 1.26 2002/08/14 17:45:19 stredwic Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -45,7 +45,7 @@ use GDBM_File;
 
 my $jr;
 
-sub BuildProblemStatisticsPage {
+sub InitializeProblemStatistics {
     my ($cacheDB, $students, $courseID, $c, $r)=@_;
     my %cache;
 
@@ -53,45 +53,45 @@ sub BuildProblemStatisticsPage {
 
     unless(tie(%cache,'GDBM_File',$cacheDB,&GDBM_READER(),0640)) {
         $r->print('Unable to tie database.');
-        return;
+        return ('ERROR', undef);
     }
 
-    my $Ptr = '';
-    $Ptr .= '<table border="0"><tbody>';
-    $Ptr .= '<tr><td align="right"><b>Select Map</b></td>'."\n";
-    $Ptr .= '<td align="left">';
-    $Ptr .= &Apache::lonhtmlcommon::MapOptions(\%cache, 'ProblemStatistics',
-                                               'Statistics');
-    $Ptr .= '</td></tr>'."\n";
-    $Ptr .= '<tr><td align="right"><b>Sorting Type:</b></td>'."\n";
-    $Ptr .= '<td align="left">'."\n";
-    $Ptr .= &Apache::lonhtmlcommon::AscendOrderOptions(
-                                            $cache{'ProblemStatisticsAscend'}, 
-                                            'ProblemStatistics',
-                                            'Statistics');
-    $Ptr .= '</td></tr>'."\n";
-    $Ptr .= &ProblemStatisticsButtons($cache{'DisplayFormat'}, 
-                                      $cache{'DisplayLegend'});
-    $Ptr .= '</table>';
-    if($cache{'DisplayLegend'} eq 'Show Legend') {
-        $Ptr .= &ProblemStatisticsLegend();
+    # Remove students who don't have the proper section.
+    my @sectionsSelected = split(':',$cache{'sectionsSelected'});
+    for(my $studentIndex=((scalar @$students)-1); $studentIndex>=0;
+        $studentIndex--) {
+        my $value = $cache{$students->[$studentIndex].':section'};
+        my $found = 0;
+        foreach (@sectionsSelected) {
+            if($_ eq 'none') {
+                if($value eq '' || !defined($value) || $value eq ' ') {
+                    $found = 1;
+                    last;
+                }
+            } else {
+                if($value eq $_) {
+                    $found = 1;
+                    last;
+                }
+            }
+        }
+        if($found == 0) {
+            splice(@$students, $studentIndex, 1);
+        }
     }
-    $r->print($Ptr);
-    $r->rflush();
-
-    my @Header = ("Homework Sets Order","#Stdnts","Tries","Mod",
-                  "Mean","#YES","#yes","%Wrng","DoDiff",
-                  "S.D.","Skew.","D.F.1st","D.F.2nd","Disc.");
-    my $color=&setbgcolor(0);
 
 #    my %Discuss=&Apache::loncoursedata::LoadDiscussion($courseID);
-#    my ($upper, $lower) = &Discriminant(\%discriminant,$r);
-    if(!defined($cache{'StatisticsCached'})) {
+    my $lastStatus = (defined($cache{'StatisticsLastStatus'})) ?
+                     $cache{'StatisticsLastStatus'} : 'Nothing';
+    my $whichStudents = join(':::',sort(@$students));
+    if(!defined($cache{'StatisticsCached'}) || 
+       $lastStatus ne $cache{'Status'} ||
+       $whichStudents ne $cache{'StatisticsWhichStudents'}) {
         if(defined($cache{'StatisticsCached'})) {
             untie(%cache);
             unless(tie(%cache,'GDBM_File',$cacheDB,&GDBM_WRCREAT(),0640)) {
                 $r->print('Unable to tie database.');
-                return;
+                return ('ERROR', undef);
             }
             my @statkeys = split(':::', $cache{'StatisticsKeys'});
             delete $cache{'StatisticsKeys'};
@@ -108,11 +108,11 @@ sub BuildProblemStatisticsPage {
                                                                   'true',
                                                                   $courseID,
                                                                   $r, $c);
-        if($c->aborted()) { return; }
+        if($c->aborted()) { return ('ERROR', undef); }
 
         unless(tie(%cache,'GDBM_File',$cacheDB,&GDBM_READER(),0640)) {
             $r->print('Unable to tie database.');
-            return;
+            return ('ERROR', undef);
         }
         my ($problemData) = &ExtractStudentData(\%cache, $students);
         &CalculateStatistics($problemData, \%cache);
@@ -120,24 +120,89 @@ sub BuildProblemStatisticsPage {
 
         unless(tie(%cache,'GDBM_File',$cacheDB,&GDBM_WRCREAT(),0640)) {
             $r->print('Unable to tie database.');
-            return;
+            return ('ERROR', undef);
         }
         foreach(keys(%$problemData)) {
             $cache{$_} = $problemData->{$_};
         }
         $cache{'StatisticsKeys'} = join(':::', keys(%$problemData));
         $cache{'StatisticsCached'} = 'true';
+        $cache{'StatisticsLastStatus'} = $cache{'Status'};
+        $cache{'StatisticsWhichStudents'} = $whichStudents;
         untie(%cache);
 
         unless(tie(%cache,'GDBM_File',$cacheDB,&GDBM_READER(),0640)) {
             $r->print('Unable to tie database.');
-            return;
+            return ('ERROR', undef);
         }
     }
+
     my $orderedProblems = &SortProblems(\%cache, 
                                         $cache{'ProblemStatisticsSort'},
+                                        $cache{'SortProblems'},
                                         $cache{'ProblemStatisticsAscend'});
-    &BuildStatisticsTable(\%cache, $cache{'DisplayFormat'}, $orderedProblems, 
+    return ('OK', $orderedProblems);
+}
+
+sub BuildProblemStatisticsPage {
+    my ($cacheDB, $students, $courseID, $c, $r)=@_;
+
+    my @Header = ("Homework Sets Order","#Stdnts","Tries","Mod",
+                  "Mean","#YES","#yes","%Wrng","DoDiff",
+                  "S.D.","Skew.","D.F.1st","D.F.2nd","Disc.");
+    my $color=&setbgcolor(0);
+    my %cache;
+
+    unless(tie(%cache,'GDBM_File',$cacheDB,&GDBM_READER(),0640)) {
+        $r->print('Unable to tie database.');
+        return;
+    }
+    my $Ptr = '';
+    $Ptr .= '<table border="0"><tbody>';
+    $Ptr .= '<tr><td align="right"><b>Select Map</b></td>'."\n";
+    $Ptr .= '<td align="left">';
+    $Ptr .= &Apache::lonhtmlcommon::MapOptions(\%cache, 'ProblemStatistics',
+                                               'Statistics');
+    $Ptr .= '</td></tr>'."\n";
+    $Ptr .= '<tr><td align="right"><b>Sorting Type:</b></td>'."\n";
+    $Ptr .= '<td align="left">'."\n";
+    $Ptr .= &Apache::lonhtmlcommon::AscendOrderOptions(
+                                            $cache{'ProblemStatisticsAscend'}, 
+                                            'ProblemStatistics',
+                                            'Statistics');
+    $Ptr .= '</td></tr>'."\n";
+    $Ptr .= '<tr><td align="right"><b>Select Sections</b>';
+    $Ptr .= '</td>'."\n";
+    $Ptr .= '<td align="left">'."\n";
+    my @sections = split(':',$cache{'sectionList'});
+    my @sectionsSelected = split(':',$cache{'sectionsSelected'});
+    $Ptr .= &Apache::lonhtmlcommon::MultipleSectionSelect(\@sections,
+                                                          \@sectionsSelected,
+                                                          'Statistics');
+    $Ptr .= '</td></tr>'."\n";
+    $Ptr .= &ProblemStatisticsButtons($cache{'DisplayFormat'}, 
+                                      $cache{'DisplayLegend'},
+                                      $cache{'SortProblems'});
+    $Ptr .= '</table>';
+    if($cache{'DisplayLegend'} eq 'Show Legend') {
+        $Ptr .= &ProblemStatisticsLegend();
+    }
+    $r->print($Ptr);
+    $r->rflush();
+    untie(%cache);
+
+    my ($result, $orderedProblems) =
+        &InitializeProblemStatistics($cacheDB, $students, $courseID, $c, $r);
+    if($result ne 'OK') {
+        return;
+    }
+
+    unless(tie(%cache,'GDBM_File',$cacheDB,&GDBM_READER(),0640)) {
+        $r->print('Unable to tie database.');
+        return;
+    }
+    &BuildStatisticsTable(\%cache, $cache{'DisplayFormat'}, 
+                          $cache{'SortProblems'}, $orderedProblems, 
                           \@Header, $r, $color);
     untie(%cache);
 
@@ -145,12 +210,18 @@ sub BuildProblemStatisticsPage {
 }
 
 sub BuildGraphicChart {
-    my ($graph,$cacheDB,$courseDescription,$r)=@_;
+    my ($graph,$cacheDB,$courseDescription,$students,$courseID,$r,$c)=@_;
     my %cache;
     my $max = 0;
 
+    my ($result, undef) = 
+        &InitializeProblemStatistics($cacheDB, $students, $courseID, $c, $r);
+    if($result ne 'OK') {
+        return;
+    }
+
     unless(tie(%cache,'GDBM_File',$cacheDB,&GDBM_READER(),0640)) {
-        return '<html><body>Unable to tie database.</body></html>';
+        return 'Unable to tie database.';
     }
    
     my @problems = split(':::', $cache{'problemList'});
@@ -170,7 +241,6 @@ sub BuildGraphicChart {
     untie(%cache);
 
     my $sendValues = join(',', @values);
-#    my $sendCount = $#values;
     my $sendCount = scalar(@values);
 
     my $title = '';
@@ -183,7 +253,8 @@ sub BuildGraphicChart {
                  $sendValues);
 
     $r->print('</form>'."\n");
-    $r->print('<IMG src="/cgi-bin/graph.gif?'.(join('&', @GData)).'" border="1" />');
+    $r->print('<IMG src="/cgi-bin/graph.gif?'.(join('&', @GData)).
+              '" border="1" />');
     $r->print('<form>'."\n");
 
     return;
@@ -209,7 +280,8 @@ sub CreateProblemStatisticsTableHeading
 }
 
 sub BuildStatisticsTable {
-    my ($cache,$displayFormat,$orderedProblems,$headings,$r,$color)=@_;
+    my ($cache,$displayFormat,$sortProblems,$orderedProblems,$headings,
+        $r,$color)=@_;
 
 #6666666
 #    my $file="/home/httpd/perl/tmp/183d.txt";
@@ -225,27 +297,42 @@ sub BuildStatisticsTable {
 ##777777
 ##    $Str .= &Classify($discriminantFactor, $students);
 
-     if($displayFormat ne 'Display CSV Format') {
-        $r->print('<table border="0"><tr><td bgcolor="#777777">'."\n");
-        $r->print('<table border="0" cellpadding="3">'."\n");
-        $r->print(&CreateProblemStatisticsTableHeading($headings, $r));
-    } else {
-        $r->print('<br>');
-    }
-
     my $count = 1;
+    my $currentSequence = -1;
     foreach(@$orderedProblems) {
         my ($sequence,$problem,$part)=split(':', $_);
-        if($cache->{'ProblemStatisticsMaps'} ne 'All Maps'  &&
-           $cache->{'ProblemStatisticsMaps'} ne $cache->{$sequence.':title'}) {
+        if($cache->{'StatisticsMaps'} ne 'All Maps'  &&
+           $cache->{'StatisticsMaps'} ne $cache->{$sequence.':title'}) {
             next;
         }
 
+        if($currentSequence == -1 || 
+           ($sortProblems eq 'Sort Within Sequence' && 
+            $currentSequence != $sequence)) {
+            if($displayFormat ne 'Display CSV Format') {
+                if($currentSequence ne -1) {
+                    $r->print('</table>');
+                    $r->print('</td></tr></table><br>');
+                }
+                if($sortProblems eq 'Sort Within Sequence') {
+                    $r->print('<b>'.$cache->{$sequence.':title'}.'</b>');
+                }
+                $r->print('<table border="0"><tr><td bgcolor="#777777">'."\n");
+                $r->print('<table border="0" cellpadding="3">'."\n");
+                $r->print(&CreateProblemStatisticsTableHeading($headings, $r));
+            } else {
+                if($sortProblems eq 'Sort Within Sequence') {
+                    $r->print('"'.$cache->{$sequence.':title'}.'"');
+                }
+                $r->print('<br>');
+            }
+            $currentSequence = $sequence;
+        }
+
         my $ref = '<a href="'.$cache->{$problem.':source'}.
                   '" target="_blank">'.$cache->{$problem.':title'}.'</a>';
-#        my $ref = $cache->{$problem.':title'};
         my $title = $cache->{$problem.':title'};
-        my $source = 'source';
+        my $source = $cache->{$problem.':source'};
         my $tableData = join('&', $ref, $title, $source,
                        $cache->{$_.':studentCount'},
                        $cache->{$_.':totalTries'},
@@ -261,25 +348,21 @@ sub BuildStatisticsTable {
                        sprintf("%.2f", $cache->{$_.':discriminationFactor2'}),
                        0); # 0 is for discussion, need to figure out
 
-#6666666
-#	    $r->print('<br>'.$out.'&'.$DoD);
-#            print (OUT $out.'@'.$DoD.'&');
-#6666666
-
-#check with Gerd
-#        $urlres=~/^(\w+)\/(\w+)/;
-#        if ($StdNo) {
-#            &Apache::lonnet::put('nohist_resevaldata',\%storestats,
-#                                 $1,$2);
-#        }
-#-------------------------------- Row of statistical table
         &TableRow($displayFormat,$tableData,$count,$r,$color);
+
         $count++;
     }
-    if($cache->{'DisplayFormat'} ne 'Display CSV Format') {
+    if($displayFormat ne 'Display CSV Format') {
         $r->print('</table>'."\n");
+        $r->print('</td></tr></table>');
+    } else {
+        $r->print('<br>');
     }
-    $r->print('</td></tr></table>');
+#6666666
+#	    $r->print('<br>'.$out.'&'.$DoD);
+#            print (OUT $out.'@'.$DoD.'&');
+#6666666
+
 #6666666
 #    close( OUT );
 #666666
@@ -292,43 +375,43 @@ sub TableRow {
        $Wrng,$DoD,$SD,$Sk,$_D1,$_D2,$DiscNo,$Prob)=split(/\&/,$Str);	
     my $Ptr;
     if($displayFormat eq 'Display CSV Format') {
-        $Ptr="\n".'<br>'.
-             "\n".'"'.$RealIdx.'",'.
-             "\n".'"'.$title.'",'.
-             "\n".'"'.$source.'",'.
-             "\n".'"'.$StdNo.'",'.
-             "\n".'"'.$TotalTries.'",'.
-             "\n".'"'.$MxTries.'",'.
-             "\n".'"'.$Avg.'",'.
-             "\n".'"'.$YES.'",'.
-             "\n".'"'.$Override.'",'.
-             "\n".'"'.$Wrng.'",'.
-             "\n".'"'.$DoD.'",'.
-             "\n".'"'.$SD.'",'.
-             "\n".'"'.$Sk.'",'.
-             "\n".'"'.$_D1.'",'.
-	     "\n".'"'.$_D2.'"'.
-	     "\n".'"'.$DiscNo.'"';
+        $Ptr='"'.$RealIdx.'",'."\n".
+             '"'.$title.'",'."\n".
+             '"'.$source.'",'."\n".
+             '"'.$StdNo.'",'."\n".
+             '"'.$TotalTries.'",'."\n".
+             '"'.$MxTries.'",'."\n".
+             '"'.$Avg.'",'."\n".
+             '"'.$YES.'",'."\n".
+             '"'.$Override.'",'."\n".
+             '"'.$Wrng.'",'."\n".
+             '"'.$DoD.'",'."\n".
+             '"'.$SD.'",'."\n".
+             '"'.$Sk.'",'."\n".
+             '"'.$_D1.'",'."\n".
+             '"'.$_D2.'"'."\n".
+             '"'.$DiscNo.'"'."\n".
+             "<br>\n";
 
         $r->print("\n".$Ptr);
     } else {
-        $Ptr="\n".'<tr>'.
-             "\n".'<td bgcolor="#ffffe6">'.$RealIdx.'</td>'.
-             "\n".'<td bgcolor="#ffffe6">'.$ref.'</td>'.
-             "\n".'<td bgcolor='.$color->{"yellow"}.'> '.$StdNo.'</td>'.
-             "\n".'<td bgcolor='.$color->{"yellow"}.'>'.$TotalTries.'</td>'.
-             "\n".'<td bgcolor='.$color->{"yellow"}.'>'.$MxTries.'</td>'.
-             "\n".'<td bgcolor='.$color->{"gb"}.'>'.$Avg.'</td>'.
-             "\n".'<td bgcolor='.$color->{"gb"}.'> '.$YES.'</td>'.
-             "\n".'<td bgcolor='.$color->{"gb"}.'> '.$Override.'</td>'.
-             "\n".'<td bgcolor='.$color->{"red"}.'> '.$Wrng.'</td>'.
-             "\n".'<td bgcolor='.$color->{"red"}.'> '.$DoD.'</td>'.
-             "\n".'<td bgcolor='.$color->{"green"}.'> '.$SD.'</td>'.
-             "\n".'<td bgcolor='.$color->{"green"}.'> '.$Sk.'</td>'.
-             "\n".'<td bgcolor='.$color->{"purple"}.'> '.$_D1.'</td>'.
-	     "\n".'<td bgcolor='.$color->{"purple"}.'> '.$_D2.'</td>'.
-             "\n".'<td bgcolor='.$color->{"yellow"}.'> '.$DiscNo.'</td>';
-        $r->print("\n".$Ptr.'</tr>' );
+        $Ptr='<tr>'."\n".
+             '<td bgcolor="#ffffe6">'.$RealIdx.'</td>'."\n".
+             '<td bgcolor="#ffffe6">'.$ref.'</td>'."\n".
+             '<td bgcolor='.$color->{"yellow"}.'> '.$StdNo.'</td>'."\n".
+             '<td bgcolor='.$color->{"yellow"}.'>'.$TotalTries.'</td>'."\n".
+             '<td bgcolor='.$color->{"yellow"}.'>'.$MxTries.'</td>'."\n".
+             '<td bgcolor='.$color->{"gb"}.'>'.$Avg.'</td>'."\n".
+             '<td bgcolor='.$color->{"gb"}.'> '.$YES.'</td>'."\n".
+             '<td bgcolor='.$color->{"gb"}.'> '.$Override.'</td>'."\n".
+             '<td bgcolor='.$color->{"red"}.'> '.$Wrng.'</td>'."\n".
+             '<td bgcolor='.$color->{"red"}.'> '.$DoD.'</td>'."\n".
+             '<td bgcolor='.$color->{"green"}.'> '.$SD.'</td>'."\n".
+             '<td bgcolor='.$color->{"green"}.'> '.$Sk.'</td>'."\n".
+             '<td bgcolor='.$color->{"purple"}.'> '.$_D1.'</td>'."\n".
+	     '<td bgcolor='.$color->{"purple"}.'> '.$_D2.'</td>'."\n".
+             '<td bgcolor='.$color->{"yellow"}.'> '.$DiscNo.'</td>'."\n";
+        $r->print($Ptr.'</tr>'."\n");
     }
 
     return;
@@ -356,7 +439,7 @@ sub setbgcolor {
 }
 
 sub ProblemStatisticsButtons {
-    my ($displayFormat, $displayLegend)=@_;
+    my ($displayFormat, $displayLegend, $sortProblems)=@_;
 
     my $Ptr = '<tr><td></td><td align="left">';
     $Ptr .= '<input type="submit" name="DoDiffGraph" ';
@@ -365,6 +448,13 @@ sub ProblemStatisticsButtons {
     $Ptr .= '<input type="submit" name="PercentWrongGraph" ';
     $Ptr .= 'value="%Wrong Graph" />'."\n";
     $Ptr .= '</td></tr><tr><td></td><td>'."\n";
+    $Ptr .= '<input type="submit" name="SortProblems" ';
+    if($sortProblems eq 'Sort All Problems') {
+        $Ptr .= 'value="Sort Within Sequence" />'."\n";
+    } else {
+        $Ptr .= 'value="Sort All Problems" />'."\n";
+    }
+    $Ptr .= '&nbsp;&nbsp;&nbsp;';
     $Ptr .= '<input type="submit" name="DisplayLegend" ';
     if($displayLegend eq 'Show Legend') {
         $Ptr .= 'value="Hide Legend" />'."\n";
@@ -559,7 +649,7 @@ sub SortDivideByTries {
 }
 
 sub SortProblems {
-    my ($problemData,$sortBy,$ascend)=@_;
+    my ($problemData,$sortBy,$sortProblems,$ascend)=@_;
 
     my @problems = split(':::', $problemData->{'problemList'});
     if($sortBy eq "Homework Sets Order") {
@@ -583,9 +673,24 @@ sub SortProblems {
     elsif($sortBy eq "Disc.")   { $data = ''; }
     else                        { return \@problems; }
 
-    my @orderedProblems = 
-        sort { $problemData->{$a.$data} <=> $problemData->{$b.$data} }
-             @problems;
+    my %temp;
+    foreach(@problems) {
+        my ($sequence) = split(':', $_);
+        $temp{$_} = $sequence;
+    }
+
+    my @orderedProblems;
+    if($sortProblems eq "Sort Within Sequence") {
+        @orderedProblems = 
+            sort { $temp{$a} cmp $temp{$b} ||
+                   $problemData->{$a.$data} <=> $problemData->{$b.$data} }
+        @problems;
+    } else {
+        @orderedProblems = 
+            sort { $problemData->{$a.$data} <=> $problemData->{$b.$data} }
+        @problems;
+    }
+
     if($ascend eq 'Descending') {
         @orderedProblems = reverse(@orderedProblems);
     }
@@ -647,13 +752,13 @@ sub CalculateStatistics {
         foreach my $name (@upper1) {
             $upper1Sum += $cache->{"$name:$problem:$part:awarded"};
         }
-        $upper1Sum /= (scalar(@upper1)) ? (scalar(@upper1)) : 0;
+        $upper1Sum = (scalar(@upper1)) ? ($upper1Sum/(scalar(@upper1))) : 0;
 
         my $lower1Sum=0;
         foreach my $name (@lower1) {
             $lower1Sum += $cache->{"$name:$problem:$part:awarded"};
         }
-        $lower1Sum /= (scalar(@lower1)) ? (scalar(@lower1)) : 0;
+        $lower1Sum = (scalar(@lower1)) ? ($lower1Sum/(scalar(@lower1))) : 0;
 
         $data->{$_.':discriminationFactor1'} = $upper1Sum - $lower1Sum;
 
@@ -665,13 +770,13 @@ sub CalculateStatistics {
         foreach my $name (@upper2) {
             $upper2Sum += $cache->{"$name:$problem:$part:awarded"};
         }
-        $upper2Sum /= (scalar(@upper2)) ? (scalar(@upper2)) : 0;
+        $upper2Sum = (scalar(@upper2)) ? ($upper2Sum/(scalar(@upper2))) : 0;
 
         my $lower2Sum=0;
         foreach my $name (@lower2) {
             $lower2Sum += $cache->{"$name:$problem:$part:awarded"};
         }
-        $lower2Sum /= (scalar(@lower2)) ? (scalar(@lower2)) : 0;
+        $lower2Sum = (scalar(@lower2)) ? ($lower2Sum/(scalar(@lower2))) : 0;
 
         $data->{$_.':discriminationFactor2'} = $upper2Sum - $lower2Sum;
     }