--- loncom/interface/statistics/lonproblemstatistics.pm	2002/08/02 21:04:46	1.11
+++ loncom/interface/statistics/lonproblemstatistics.pm	2002/08/12 18:21:42	1.18
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # (Publication Handler
 #
-# $Id: lonproblemstatistics.pm,v 1.11 2002/08/02 21:04:46 minaeibi Exp $
+# $Id: lonproblemstatistics.pm,v 1.18 2002/08/12 18:21:42 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -31,7 +31,7 @@
 # 11/1,11/4,11/16,12/14,12/16,12/18,12/20,12/31 Behrouz Minaei
 # YEAR=2002
 # 1/22,2/1,2/6,2/25,3/2,3/6,3/17,3/21,3/22,3/26,4/7,5/6 Behrouz Minaei
-# 5/12,5/14,5/15,5/19,5/26,7/16,7/25,7/29  Behrouz Minaei
+# 5/12,5/14,5/15,5/19,5/26,7/16,7/25,7/29,8/5  Behrouz Minaei
 #
 ###
 
@@ -47,8 +47,8 @@ use GDBM_File;
 sub BuildProblemStatisticsPage {
     my ($cacheDB, $students, $courseID, $c, $r)=@_;
     my %cache;
-    #my %DoDiff;
-    unless(tie(%cache,'GDBM_File',$cacheDB,&GDBM_READER,0640)) {
+
+    unless(tie(%cache,'GDBM_File',$cacheDB,&GDBM_READER(),0640)) {
         return '<html><body>Unable to tie database.</body></html>';
     }
 
@@ -70,53 +70,74 @@ sub BuildProblemStatisticsPage {
     $Ptr .= '</table>';
     $Ptr .= &ProblemStatisticsLegend();
     $r->print($Ptr);
+    $r->rflush();
 
     untie(%cache);
+    &Create_PrgWin($r);
+    my $count=0;
     foreach (@$students) {
+        &Update_PrgWin(scalar(@$students),$count,$_,$r);
         my $courseData = 
             &Apache::loncoursedata::DownloadCourseInformation($_, $courseID);
         last if ($c->aborted());
-        if(tie(%cache,'GDBM_File',$cacheDB,&GDBM_WRCREAT,0640)) {
+        if(tie(%cache,'GDBM_File',$cacheDB,&GDBM_WRCREAT(),0640)) {
             &Apache::loncoursedata::ProcessStudentData(\%cache, 
                                                        $courseData, $_);
             untie(%cache);
         }
+        $count++;
     }
+    &Close_PrgWin($r);
     if($c->aborted()) { return; }
 
-    unless(tie(%cache,'GDBM_File',$cacheDB,&GDBM_READER,0640)) {
+    unless(tie(%cache,'GDBM_File',$cacheDB,&GDBM_READER(),0640)) {
         return '<html><body>Unable to tie database.</body></html>';
     }
-    my %discriminant=();
-    my @list=();
-    my %Discuss=&Apache::loncoursedata::LoadDiscussion($courseID);
-    my $index=0;
-    foreach (@$students) {
-	$index++;
-	#&Apache::lonstatistics::Update_PrgWin(++$index,$r);
-        &ExtractStudentData(\%cache, $_, \@list,\%Discuss, $r, \%discriminant);
-    }
-    #&Apache::lonstatistics::Close_PrgWin($r);
- 
-    my ($upper, $lower) = &Discriminant(\%discriminant,$r);
+
     my %Header = (0,"Homework Sets Order",1,"#Stdnts",2,"Tries",3,"Mod",
                   4,"Mean",5,"#YES",6,"#yes",7,"%Wrng",8,"DoDiff",
                   9,"S.D.",10,"Skew.",11,"D.F.1st",12,"D.F.2nd", 13, "Disc.");
     my $color=&setbgcolor(0);
-    my %GraphDat= &BuildStatisticsTable(\%cache, $upper, $lower, \@list, 
-                                        \%Header, $students, $r, $color);
-    untie(%cache);
-}
 
+    my $state=$ENV{'form.ProblemStatisticsHeading'}; 
 
-#---- Problem Statistics Web Page ---------------------------------------
+    my $TempCache;
 
+    if ($state) {
+	$TempCache=&CacheStatisticsTable($state,\%cache,\%Header,
+					 $r,$color);
+    } else {    
+	my %discriminant=();
+	my @list=();
+	my %Discuss=&Apache::loncoursedata::LoadDiscussion($courseID);
+	my $index=0;
+	foreach (@$students) {
+	    $index++;
+	    &ExtractStudentData(\%cache, $_, \@list,\%Discuss, $r,
+                                \%discriminant);
+	}
+	my ($upper, $lower) = &Discriminant(\%discriminant,$r);
+	$TempCache= &BuildStatisticsTable(\%cache, $upper, $lower, 
+					   \@list, \%Header, $students,
+					   $r, $color);
+    }
+    untie(%cache);
 
-sub NumericSort {          
-    $a <=> $b;
+    foreach (keys %$TempCache) {
+        last if ($c->aborted());
+        if(tie(%cache,'GDBM_File',$cacheDB,&GDBM_WRCREAT(),0640)) {
+	    $cache{$_}=$TempCache->{$_};
+
+            untie(%cache);
+        }
+    }
+    if($c->aborted()) { return; }
+    untie(%cache);
 }
 
 
+#---- Problem Statistics Web Page ---------------------------------------
+
 sub CreateProblemStatisticsTableHeading {
     my ($displayFormat,$sequenceSource,$sequenceTitle,$headings,$r)=@_;
     if($displayFormat eq 'Display CSV Format') {
@@ -124,10 +145,12 @@ sub CreateProblemStatisticsTableHeading
         $r->print($sequenceSource.'"');
 	return;
     }
-
-    $r->print('<br><a href="'.$sequenceSource.
-              '" target="_blank">'.$sequenceTitle.'</a>');
-
+    if ($sequenceSource eq 'Sorted by: ') {
+	$r->print('<br><b>'.$sequenceSource.$sequenceTitle.'</b>');
+    } else {
+        $r->print('<br><a href="'.$sequenceSource.
+		  '" target="_blank">'.$sequenceTitle.'</a>');
+    }
     my $Result = "\n".'<table border=2><tr><th>P#</th>'."\n";
     for(my $nIndex=0; $nIndex < (scalar (keys %$headings)); $nIndex++) { 
 	$Result .= '<th>'.'<input type="submit" name="';
@@ -149,6 +172,41 @@ sub CloseTable {
 }
 
 
+# Create progress
+sub Create_PrgWin {
+    my ($r)=@_;
+    $r->print(<<ENDPOP);
+    <script>
+    popwin=open('','popwin','width=400,height=100');
+    popwin.document.writeln('<html><body bgcolor="#88DDFF">'+
+      '<title>LON-CAPA Statistics</title>'+
+      '<h4>Computation Progress</h4>'+
+      '<form name=popremain>'+
+      '<input type=text size=35 name=remaining value=Starting></form>'+
+      '</body></html>');
+    popwin.document.close();
+    </script>
+ENDPOP
+
+    $r->rflush();
+}
+
+# update progress
+sub Update_PrgWin {
+    my ($totalStudents,$index,$name,$r)=@_;
+    $r->print('<script>popwin.document.popremain.remaining.value="'.
+              'Computing '.$index.'/'.$totalStudents.': '.
+              $name.'";</script>');
+    $r->rflush();
+}
+
+# close Progress Line
+sub Close_PrgWin {
+    my ($r)=@_;
+    $r->print('<script>popwin.close()</script>');
+    $r->rflush(); 
+}
+
  
 # ------ Dump the Student's DB file and handling the data for statistics table 
 sub ExtractStudentData {
@@ -175,17 +233,12 @@ sub ExtractStudentData {
 	my $tempProblemOrder=100;
         if($cache->{'ProblemStatisticsMaps'} ne 'All Maps'  &&
            $cache->{'ProblemStatisticsMaps'} ne $cache->{$sequence.':title'}) {
-#	    $r->print("<br>sequences=$cache->{'orderedSequences'}");
-#	    $r->print("<br>".$cache->{$sequence.':title'});
             next;
         }
 	$tempSequenceOrder++;
 
-        #$discrim .= '&';
         foreach my $problemID (split(':', $cache->{$sequence.':problems'})) {
-#	    $r->print("<br>problems=$cache->{$sequence.':problems'}");
             my $problem = $cache->{$problemID.':problem'};
-#	    $r->print("<br>$problemID === $problem");
             my $LatestVersion = $cache->{$name.':version:'.$problem};
 	    # Output dashes for all the parts of this problem if there
             # is no version information about the current problem.
@@ -209,7 +262,6 @@ sub ExtractStudentData {
                                                   ':parts'})) {
 		$tempProblemOrder++;
 		$partData{'count'}++;
-#		$r->print("<br>parts=$cache->{$sequence.':'.$problemID.':parts'}");
                 $partData{$part.':order'}=$tempProblemOrder;
                 $partData{$part.':tries'}=0;
                 $partData{$part.':code'}='-';
@@ -261,10 +313,6 @@ sub ExtractStudentData {
                 }
             }
 
-#$Apache::lonxml::debug=1;
-#&Apache::lonhomework::showhash(%partData);
-#$Apache::lonxml::debug=0;
-
             # Loop through all the parts for the current problem in the 
             # correct order and prepare the output
 	    my $partCounter=0;
@@ -282,9 +330,7 @@ sub ExtractStudentData {
                 if($partData{'count'} > 1) {
                     $ptr .= "*(part $_)";
                 }
-                #if($partCounter > 1) {
-                    $discrim .= '&';
-                #}
+                $discrim .= '&';
 
 		my ($pr_no,$dod)=split('&',$ptr);
 #		my $DoDiff=$DoDiff->{$dod};
@@ -348,25 +394,24 @@ sub ExtractStudentData {
     }
 }
 
+sub NumericSort {
+    $a <=> $b;
+}
 
-=pod
-sub MySort {          
-    if ( $Pos > 0 ) {
-	if ($ENV{'form.order'} eq 'Descending') {$b <=> $a;}
-	else { $a <=> $b; }
-    }
-    else {
-	if ($ENV{'form.order'} eq 'Descending') {$b cmp $a;}
-	else { $a cmp $b; }
+sub OrderedSort  {
+    if ($ENV{'form.order'} eq 'Descending') {
+	$b <=> $a;
+    } else { 
+	$a <=> $b;
     }
 }
-=cut
+
 
 
 sub BuildStatisticsTable {
     my ($cache,$upper,$lower,$list,$headings,$students,$r,$color)=@_;
     my $NoElements = scalar @$list;
-    my @List=sort(@$list);
+    my @list=sort(@$list);
 
 #6666666
 #    my $file="/home/httpd/perl/tmp/183d.txt";
@@ -386,7 +431,7 @@ sub BuildStatisticsTable {
     my $dummy;
     my $p_val;
     my $ResId;
-    my %GraphDat;
+    my %TempCache;
     my $cIdx=0;
 
     foreach my $sequence (split(':', $cache->{'orderedSequences'})) {
@@ -399,7 +444,7 @@ sub BuildStatisticsTable {
                                              $cache->{$sequence.':title'}, 
                                              $headings,$r);
 	my ($tar,$Tries,$Wrongs,$Code,$Disc)=split(/\&/,
-                                                   $List[$cIdx]);
+                                                   $list[$cIdx]);
         my ($SqOrd,$PrOrd,$Prob)=split(/\:/,$tar);
 	$sequence+=100;
 	while ($SqOrd==$sequence && $cIdx<$NoElements) {
@@ -426,32 +471,20 @@ sub BuildStatisticsTable {
 		elsif( $Code eq 'O' ) { $Override++; }
 		elsif( $Code eq '-' ) { $StdNo--; }
 		($tar,$Tries,$Wrongs,$Code,$Disc)=split(/\&/,
-                                                     $List[$cIdx]);
+                                                     $list[$cIdx]);
 	        ($SqOrd,$PrOrd,$Prob)=split(/\:/,$tar);
 	    }
 
 	    $p_count++;
 	    my $Dummy;
 	    ($ResId,$Dummy)=split(/\*/,$Temp);
-
-######################
 	    $Temp = '<a href="'.$cache->{$ResId.':source'}.
                 '" target="_blank">'.$cache->{$ResId.':title'}.$Dummy.'</a>';
 
-	    #$r->print('<br>rid='.$ResId);
-	    #$r->print('<br>src='.$cache->{$ResId.':source'});
-	    #$r->print('<br>tit='.$cache->{$ResId.':title'});
-
-	    my $res = &Apache::lonnet::declutter($cache->{$ResId.':source'});
-	    my $urlres=$res;
-
-	    $ResId=~/(\d+)\.(\d+)/;
-	    my $Map = &Apache::lonnet::declutter( $cache->{'map_id_'.$1} );
-	    $urlres=$Map;
-#######################
-
-#	    $res = '<a href="'.$cache->{$ResId.':source'}.'">'.$res.'</a>';
-	    #$Map = '<a href="'.$Map.'">'.$res.'</a>';
+#	    my $urlres = $cache->{$sequence.':source'});
+#check with Gerd
+	    #symb of the problem (already decluttered and cleaned)
+	    my $urlres = $cache->{$ResId.':problem'};
 
 #------------------------ Compute the Average of Tries about one problem
 	    my $Average = ($StdNo) ? $TotalTries/$StdNo : 0;
@@ -459,7 +492,7 @@ sub BuildStatisticsTable {
 	    $storestats{$ENV{'request.course.id'}.'___'.$urlres.'___timestamp'}=time;
 	    $storestats{$ENV{'request.course.id'}.'___'.$urlres.'___stdno'}=$StdNo;
 	    $storestats{$ENV{'request.course.id'}.'___'.$urlres.'___avetries'}=$Average;
-   
+
 #-------------------------------- Compute percentage of Wrong tries
 	    my $Wrong = ( $StdNo ) ? 100 * ( $Incorrect / $StdNo ) : 0;
 
@@ -510,92 +543,111 @@ sub BuildStatisticsTable {
 	    my $SD = sprintf( "%.1f", $StdDev );
 	    my $DoD = sprintf( "%.2f", $DoDiff );
 	    my $Sk = sprintf( "%.1f", $Skewness );
-	    my $join = $Prob.'&'.$Temp.'&'.$StdNo.'&'.
+	    my $join = $sequence.'@'.$pOrd.'&'.$Temp.'&'.$StdNo.'&'.
                        $TotalTries.'&'.$MxTries.'&'.$Avg.'&'.
                        $YES.'&'.$Override.'&'.$Wrng.'&'.$DoD.'&'.
 		       $SD.'&'.$Sk.'&'.$_D1.'&'.$_D2.'&'.
                        $DiscNo.'&'.$Prob;
 
-#####{$sequence.'@'.$pOrd}
-	  #  $cache->{'tableCache:'.$p_count-1}=$join;
+	    $TempCache{'CacheTable:'.($p_count-1)}=$join;
 
 #6666666
 #	    $r->print('<br>'.$out.'&'.$DoD);
 #            print (OUT $out.'@'.$DoD.'&');
 #6666666
 
+#check with Gerd
 	    $urlres=~/^(\w+)\/(\w+)/;
-	    if ($StdNo) { 
-		&Apache::lonnet::put('resevaldata',\%storestats,$1,$2); 
+	    if ($StdNo) {
+		&Apache::lonnet::put('nohist_resevaldata',\%storestats,
+				     $1,$2);
 	    }
 #-------------------------------- Row of statistical table
-            &TableRow($cache,$join,$cIdx,($p_count-1),$r,$color,\%GraphDat);
+            &TableRow($cache,$join,$cIdx,($p_count-1),$r,$color,
+                      \%TempCache);
 	}
+	$TempCache{'ProblemCount'}=$p_count;
 	&CloseTable($cache,$r);
     }
 ###    &Close_PrgWin();
-#666666
+#6666666
 #    close( OUT );
 #666666
+    return \%TempCache;
 }
 
-=pod
-sub Cache_Statistics {
-    my ($cache,$color)=@_;
-    my @list = ();
-    my $Useful;
-    my $UnUseful;
-#    $r->print('<input type="hidden" name="show" value="excel" />'."\n"); 
-    my %myHeader = reverse( %Header );
-    $Pos = $myHeader{$ENV{'form.sort'}};
-    if ($Pos > 0) {$Pos++;}
-    my $p_count = 0;
-    foreach my $key( keys %CachData) { 
-	my @Temp=split(/\&/,$CachData{$key});
-	if ( $Pos == 0 ) {
-	    ($UnUseful,$Useful)=split(/\>/,$Temp[$Pos]);
-	}
-	else {
-	    $Useful = $Temp[$Pos];
-	}   
-	$list[$p_count]=$Useful.'@'.$CachData{$key};
-        $p_count++;
-    }
 
-    @list = sort MySort (@list);
+sub CacheStatisticsTable {
+    my ($state,$cache,$headings,$r,$color)=@_;
+    my @list = (); 
+    my %TempCache;
+    my %myHeader = reverse( %$headings );
+    my $pos = $myHeader{$state};
+    if ($pos > 0) {$pos++;}
+    my $p_count = $cache->{'ProblemCount'};
+
+    for ( my $k=0; $k<$p_count;$k++) {
+	my $key=$cache->{'CacheTable:'.$k};
+	my @Temp=split(/\&/,$key);
+	$list[$k]=$Temp[$pos].'+'.$key;
+    }
+    
+    if ($pos>0) {
+        @list = sort OrderedSort (@list);
+    } else {
+        @list = sort (@list);
+    }
+    my $cIdx=0;
 
-    my $nIndex=0;
+    if ( $pos == 0 ) {
+	foreach my $sequence (split(':', $cache->{'orderedSequences'})) {
+	    if($cache->{'ProblemStatisticsMaps'} ne 'All Maps'  &&
+	       $cache->{'ProblemStatisticsMaps'} ne $cache->{$sequence.':title'}) {
+		next;
+	    }
+	    if ($cIdx==$p_count) {
+		return \%TempCache;
+	    }
+	    &CreateProblemStatisticsTableHeading($cache->{'DisplayFormat'}, 
+                                             $cache->{$sequence.':source'},
+                                             $cache->{$sequence.':title'}, 
+                                             $headings,$r);
 
-    if ( $Pos == 0 ) {
-	foreach (sort keys %mapsort) {
-	    my ($Hid,$pr)=split(/\:/,$mapsort{$_});
-	    &CreateProblemStatisticsTableHeading($cache,1,$Hid);
-	    my @lpr=split(/\&/,$pr);
-	    for (my $i=1; $i<=$#lpr; $i++) {
-		my($Pre, $Post) = split(/\@/,$list[$nIndex]); 
-		#$r->print('<br>'.$Pre.'---'.$Post);
-		&TableRow($cache,$Post,$i,$nIndex,$color,\%GraphDat);
-		$nIndex++;
+	    my ($tar)=split(/\&/,$list[$cIdx]);
+	    $tar=~s/\+//eg;
+	    my ($SqOrd)=split(/\@/,$tar);
+	    $sequence+=100;
+	    while ($SqOrd==$sequence && $cIdx<$p_count) {
+		my($Pre, $Post) = split(/\+/,$list[$cIdx]); 
+		&TableRow($cache,$Post,$cIdx,$cIdx,$r,$color,\%TempCache);
+		$cIdx++;
+		my ($tar)=split(/\&/,$list[$cIdx]);
+		$tar=~s/\+//eg;
+		($SqOrd)=split(/\@/,$tar);
 	    }
-	    &CloseTable($cache);
+	    &CloseTable($cache,$r);
 	}
     }
     else {
-	&CreateProblemStatisticsTableHeading($cache,0);
+        &CreateProblemStatisticsTableHeading($cache->{'DisplayFormat'}, 
+                                             'Sorted by: ',
+					     $headings->{$pos-1},
+                                             $headings,$r);
 	for ( my $nIndex = 0; $nIndex < $p_count; $nIndex++ ) {
-	    my($Pre, $Post) = split(/\@/,$list[$nIndex]); 
-	    &TableRow($cache,$Post,$nIndex,$nIndex,$color,\%GraphDat);
+	    my($Pre, $Post) = split(/\+/,$list[$nIndex]);
+	    &TableRow($cache,$Post,$nIndex,$nIndex,$r,$color,\%TempCache);
 	} 
-	&CloseTable($cache);
+	&CloseTable($cache,$r);
     }
+
+    return \%TempCache;
 }
-=cut 
+
 
 sub TableRow {
     my ($cache,$Str,$Idx,$RealIdx,$r,$color,$GraphDat)=@_;
     my($PrOrd,$Temp,$StdNo,$TotalTries,$MxTries,$Avg,$YES,$Override,
        $Wrng,$DoD,$SD,$Sk,$_D1,$_D2,$DiscNo,$Prob)=split(/\&/,$Str);	
-#    $r->print('<br>'.$Str);
     my $Ptr;
     if($cache->{'DisplayFormat'} eq 'Display CSV Format') {
         my ($ResId,$Dummy)=split(/\*/,$Prob);
@@ -621,7 +673,6 @@ sub TableRow {
     } else {
         $Ptr="\n".'<tr>'.
              "\n".'<td>'.($RealIdx+1).'</td>'.
-          #  "\n".'<td>'.$PrOrd.$Temp.'</td>'.
              "\n".'<td>'.$Temp.'</td>'.
              "\n".'<td bgcolor='.$color->{"yellow"}.'> '.$StdNo.'</td>'.
              "\n".'<td bgcolor='.$color->{"yellow"}.'>'.$TotalTries.'</td>'.
@@ -638,7 +689,7 @@ sub TableRow {
              "\n".'<td bgcolor='.$color->{"yellow"}.'> '.$DiscNo.'</td>';
         $r->print("\n".$Ptr.'</tr>' );
     }
-#    $cache->{'graph_gif:'.$RealIdx}=$DoD.':'.$Wrng;
+    $GraphDat->{'GraphGif:'.$RealIdx}=$DoD.':'.$Wrng;
 }
 
 
@@ -780,9 +831,6 @@ sub ProcessDiscriminant {
 #------- Creating Discimination factor   
 sub Discriminant {
     my ($discriminant,$r)=@_;
-#$Apache::lonxml::debug=1;
-#&Apache::lonhomework::showhash(%$discriminant);
-#$Apache::lonxml::debug=0;
     my @discriminantKeys=keys(%$discriminant);
     my $Count = scalar @discriminantKeys;
 
@@ -818,69 +866,53 @@ sub Discriminant {
 
 # ------------------------------------------- Prepare data for Graphical chart
 
-sub BuildDiffGraph {
-    my ($r)=@_;
+sub BuildGraphicChart {
+    my ($ylab,$r,$cacheDB)=@_;
+    my %cache;
+    my $Col;
+    my $data='';
+    my $count = 0;
+    my $Max = 0;
 
-    my $graphData = &GetGraphData('DiffGraph', $r);
-    $r->print('<IMG src="/cgi-bin/graph.gif?'.$graphData.'" />');
+    unless(tie(%cache,'GDBM_File',$cacheDB,&GDBM_READER(),0640)) {
+        return '<html><body>Unable to tie database.</body></html>';
+    }
+   
+    my $p_count = $cache{'ProblemCount'};
 
-    return;
-}
+    for ( my $k=0; $k<$p_count;$k++) {
+        my @Temp=split(/\:/,$cache{'GraphGif:'.$k});
+        my $inf = $Temp[$Col]; 
+	if ( $Max < $inf ) {$Max = $inf;}
+      	$data .= $inf.',';
+       	$count++;
+    }
+    untie(%cache);
+#    $r->print("<br>count=$p_count >>data= $data");
 
-sub BuildWrongGraph {
-    my ($r)=@_;
+    if ( $Max > 1 ) { 
+	$Max += (10 - $Max % 10);
+      	$Max = int($Max);
+    } else { $Max = 1; }
 
-    my $graphData = &GetGraphData('WrongGraph', $r);
-    $r->print('<IMG src="/cgi-bin/graph.gif?'.$graphData.'" />');
+    my $cid=$ENV{'request.course.id'};
 
-    return;
-}
+    if ( $ylab eq 'DoDiff Graph' ) {
+	$ylab = 'Degree-of-Difficulty';
+	$Col = 0;
+    } else {
+	$ylab = 'Wrong-Percentage';
+	$Col = 1;
+    }
+    my $Course = $ENV{'course.'.$cid.'.description'};
+    $Course =~ s/\ /"_"/eg;
+    my $GData=$Course.'&'.'Problems#'.'&'.$ylab.'&'.
+	      $Max.'&'.$count.'&'.$data;
 
+    $r->print('<IMG src="/cgi-bin/graph.gif?'.$GData.'" />');
 
-sub GetGraphData {
-    my ($ylab,$r,%GraphDat)=@_;
-    my $Col;
-    my $data='';
-    my $count = 0;
-    my $Max = 0;
-    my $cid=$ENV{'request.course.id'};
-    my $GraphDB = "/home/httpd/perl/tmp/$ENV{'user.name'}".
-                  "_$ENV{'user.domain'}_$cid\_graph.db";
-    foreach (keys %GraphDat) {delete $GraphDat{$_};}
-    if (-e "$GraphDB") {
-	if (tie(%GraphDat,'GDBM_File',"$GraphDB",&GDBM_READER,0640)) {
-	    if ( $ylab eq 'DoDiff Graph' ) {
-		$ylab = 'Degree-of-Difficulty';
-		$Col = 0;
-	    }
-	    else {
-		$ylab = 'Wrong-Percentage';
-		$Col = 1;
-	    }
-	    foreach (sort NumericSort keys %GraphDat) { 
-		my @Temp=split(/\:/,$GraphDat{$_});
-                my $inf = $Temp[$Col]; 
-		if ( $Max < $inf ) {$Max = $inf;}
-		$data .= $inf.',';
-		$count++;
-	    }
-	    if ( $Max > 1 ) { 
-		$Max += (10 - $Max % 10);
-		$Max = int($Max);
-	    }
-	    else { $Max = 1; }
-            untie(%GraphDat);
-	    my $Course = $ENV{'course.'.$cid.'.description'};
-	    $Course =~ s/\ /"_"/eg;
-	    my $GData=$Course.'&'.'Problems'.'&'.$ylab.'&'.
-		      $Max.'&'.$count.'&'.$data;
-	}
-	else {
-	    $r->print("Unable to tie hash to db file");
-	}
-    }
+    return;
 }
 
-
 1;
 __END__