# The LearningOnline Network with CAPA
# (Publication Handler
#
# $Id: lonstatistics.pm,v 1.2 2002/02/05 12:24:45 minaeibi Exp $
#
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#
# (Navigate problems for statistical reports
# YEAR=2001
# 5/05/01, 7/09/01, 7/25/01, 8/11/01,9/13/01, 9/26/01 Behrouz Minaei
# 10/5/01, 10/9/01, 10/22/01, 10/26/01 Behrouz Minaei
# 11/1/01, 11/4/01, 11/16/01 Behrouz Minaei
# 12/14/01, 12/16/01, 12/18/01,12/20/01,12/31/01 Behrouz Minaei
# YEAR=2002
# 1/22/02,2/1/02
###
package Apache::lonstatistics;
use strict;
use Apache::Constants qw(:common :http);
use Apache::lonnet();
use Apache::lonhomework;
use HTML::TokeParser;
use GDBM_File;
use Benchmark;
# -------------------------------------------------------------- Module Globals
my %hash;
my %CachData;
my %GraphDat;
my %maps;
my @mapsort;
my %section;
my %StuBox;
my %DiscFac;
my $CurMap;
my $CurSec;
my $CurStu;
my @cols;
my @list;
my @students;
my $p_count;
my $Pos;
my $r;
my $OpSel1;
my $OpSel2;
my $OpSelDis1;
my $OpSelDis2;
my $CurDis=0;
my $OpSel3;
my $OpSel4;
my $GData;
my $cid;
my $firstres;
my $lastres;
my $DiscFlag=0;
my $HWN=0;
my %Header = (0,"Problem Title",1,"#Stdnts",2,"Tries",3,"Mod",
4,"Mean",5,"#YES",6,"#yes",7,"%Wrng",8,"S.D.",
9,"Skew.",10,"DoDiff",11,"Map");
# 9,"Skew.",10,"DoDiff",11,"Dis.F.",12,"Resourse URL");
my %class = qw(
);
my @LS;
my @LF;
sub GetBin {
my ($Index1,$Index2,$String,$C)=@_;
my @step = 5;
my @L=($C eq 'S') ? @LS : @LF;
my $Count=$#L+1;
$r->print("<br>zone $C ------ $String ");
for(my $n=0;$n<$Count;$n++){
my @t=split(/\:/,$L[$n]);
$r->print("<br>$t[$Index1] $t[$Index2]");
}
}
sub GetUniqe {
my ($Index,$String,$C)=@_;
my @step = 5;
my @L=($C eq 'S') ? @LS : @LF;
my $Count=$#L+1;
my @List=();
for(my $n=0;$n<$Count;$n++){
my @t=split(/\:/,$L[$n]);
push(@List,$t[$Index]);
#$r->print("<br>$t[$Index]");
}
@List = sort NumSort(@List);
$r->print("<br>zone $C ------ $String ");
my $nIdx=0;
my $nPrb=0;
my %Proc;
undef %Proc;
while ( $nIdx < $Count ) {
my $Focus=$List[$nIdx];
my $Temp = $Focus;
do {
$nIdx++;
$nPrb++;
$Focus=$List[$nIdx];
#$Proc{$name}=$Focus;
} while ( $Focus == $Temp && $nIdx < $Count );
$r->print("<br>$Temp --> $nPrb");
$nPrb=0;
}
return %Proc;
}
sub GetUniq {
my ($Index,$String)=@_;
my @step = 5;
my $Count=0;
my @List=();
my @temp=();
foreach (keys(%DiscFac)){
$Count++;
my @temp1=split(/\:/,$_);
@temp=($temp1[$Index],@temp1);
push(@List,join(':',@temp));
}
@List = sort NumericSort(@List);
$r->print("<br><br>zone ($Index) ------ $String ----- / $temp[3]");
my $nIdx=0;
my $nPrb=0;
my %Proc;
undef %Proc;
while ( $nIdx < $Count ) {
my ($Focus,$Dummy,$name)=split(/\:/,$List[$nIdx]);
my $Temp = $Focus;
$Proc{$name}=$Focus;
do {
$nIdx++;
$nPrb++;
($Focus,$Dummy,$name)=split(/\:/,$List[$nIdx]);
$Proc{$name}=$Focus;
} while ( $Focus == $Temp && $nIdx < $Count );
$r->print("<br>$Temp --> $nPrb");
$nPrb=0;
}
return %Proc;
}
sub NumericSort {
$a <=> $b;
}
#------- Classification
sub Classify {
my $Count=0;
my @List=();
# foreach(keys %class){
# $r->print("<br>$_ --> $class{$_}");
# }
# $DiscFac{($DisFactor.':'.$sname.':'.$ProbTot.':'.$TotalOpend.':'.
# $TotalTries.':'.$ProbSolved.':'.$time)}=$Dis;
@LS=();
@LF=();
my $cf=0;
my $cs=0;
foreach (keys(%DiscFac)){
my @l=split(/\:/,$_);
if ($class{$l[1]}){
if( $class{$l[1]} == 4 ) {
$cs++;
push(@LS,('S:'.$l[6].':'.$l[0].':'.$l[5].':'.$l[4].':'.$l[3].':'.$class{$l[1]}));
}
elsif ( $class{$l[1]} < 3 ) {
$cf++;
push(@LF,('F:'.$l[6].':'.$l[0].':'.$l[5].':'.$l[4].':'.$l[3].':'.$class{$l[1]}));
}
}
}
$r->print("<br>zone successful");
for(my $n=0;$n<$cs;$n++){
$r->print('<br>'.$LS[$n]);
}
$r->print("<br>zone failed");
for(my $n=0;$n<$cf;$n++){
$r->print('<br>'.$LF[$n]);
}
# my %Disc = &GetUniqe(@List,5,"Discrimination Factor");
# my %Opnd = &GetUniq(@List,3,"Total Opened");
# my %Trys = &GetUniq(@Lsit4,"Total Tries");
# my %Slvd = &GetUniq(5,"Problems Solved");
# my (@L, $Index,$String)=@_;
my %Time = &GetUniqe(1,"Time",'S');
&GetUniqe(1,"Time",'F');
&GetUniqe(2,"Discrimination Factor",'S');
&GetUniqe(2,"Discrimination Factor",'F');
&GetUniqe(3,"Solved",'S');
&GetUniqe(3,"Solved",'F');
&GetUniqe(4,"Tries",'S');
&GetUniqe(4,"Tries",'F');
&GetBin(1,2, " Time ... Discriminat",'S');
&GetBin(1,2, " Time ... Discriminat",'F');
&GetBin(1,3, " Time ... Solved",'S');
&GetBin(1,3, " Time ... Solved",'F');
&GetBin(1,4, " Time ... Tries",'S');
&GetBin(1,4, " Time ... Tries",'F');
&GetBin(2,3, " Discriminant ... Solved",'S');
&GetBin(2,3, " Discriminant ... Solved",'F');
&GetBin(2,4, " Discriminant ... Tries",'S');
&GetBin(2,4, " Discriminant ... Tries",'F');
&GetBin(3,4, " Solved ... Tries",'S');
&GetBin(3,4, " solved ... Tries",'F');
# foreach (keys(%Disc)) {
# $r->print("<br>: $Disc{$_} --> $Slvd{$_}");
# }
# $r->print("<br>..........Discriminant ... Time................");
## foreach (keys(%Disc)) {
# $r->print("<br>$Disc{$_} --> $Time{$_}");
# }
# $r->print("<br>..........Time ... Solved.......................");
# foreach (keys(%Disc)) {
# $r->print("<br>$Disc{$_} --> $Slvd{$_}");
# }
}
#------- Processing upperlist and lowerlist according to each problem
sub ProcessDisc {
my @List = @_;
@List = sort (@List);
my $Count = $#List+1;
my $Prb;
my @Dis;
my $Slvd=0;
my $tmp;
my $Sum=0;
my $nIdx=0;
my $nStud=0;
my %Proc;
undef %Proc;
while ($nIdx<$Count) {
($Prb,$tmp)=split(/\=/,$List[$nIdx]);
@Dis=split(/\+/,$tmp);
my $Temp = $Prb;
do {
$nIdx++;
$nStud++;
$Sum += $Dis[$CurDis];
($Prb,$tmp)=split(/\=/,$List[$nIdx]);
@Dis=split(/\+/,$tmp);
} while ( $Prb eq $Temp && $nIdx < $Count );
# $Proc{$Temp}=$Sum.':'.$nStud;
$Proc{$Temp}=($Sum/$nStud).':'.$nStud;
# $r->print("$nIdx) $Temp --> ($nPrb) $Proc{$Temp} <br>");
$Sum=0;
$nStud=0;
}
return %Proc;
}
#------- Creating Discimination factor table
sub DiscriminationTable {
my $Count=0;
foreach (keys(%DiscFac)){
$Count++;
}
my $UpCnt = int(0.27*$Count);
$r->print("<br><br>".
"Current map: <b>\"$CurMap\"</b> ".
"Current Section: <b>\"$CurSec\" </b> ".
"Number of valid students: <b>$Count</b>".
"<br>The <b>Upper 27%</b> has <b>$UpCnt</b> records.".
" The <b>Lower 27%</b> has <b>$UpCnt</b> records <br>".
"The Criterion of sorting the students: ".
"<b>( Sum of Partial Credits Awarded / ".
"Total Number of Tries )</b>".
" <br><br>");
$r->rflush();
my $low=0;
my $up=$Count-$UpCnt;
my @UpList=();
my @LowList=();
$Count=0;
foreach my $key (sort(keys(%DiscFac))){
$Count++;
# $r->print("$Count) $key <br>");
if ($low < $UpCnt || $Count > $up) {
$low++;
my $str=$DiscFac{$key};
# $r->print("$Count) $str <br>");
foreach(split(/\:/,$str)){
if ($_) {
if ($low<$UpCnt){push(@LowList,$_);}
else {push(@UpList,$_);}
}
}
}
}
my %Up=&ProcessDisc(@UpList);
my %Low=&ProcessDisc(@LowList);
my @list = ();
my $Useful;
my $UnUseful;
$p_count = 0;
foreach my $key( keys %CachData) {
my @Temp=split(/\:/,$CachData{$key});
($UnUseful,$Useful)=split(/\>/,$Temp[0]);
$list[$p_count]=$Useful.'&'.$CachData{$key};
$p_count++;
}
@list = sort MySort (@list);
my $Result = "\n".'<table border=2>';
$Result .= "\n".'<tr><th>P#</th>';
$Result .= "\n".'<th>'.$Header{0}.'</th>';
$Result .= "\n".'<th>'.'Discrimination Factor'.'</th>';
$Result .= "\n".'<th>'.'%Upper Award'.'</th>';
$Result .= "\n".'<th>'.'%Lower Award'.'</th>';
$Result .= "\n".'<th>'.'Upper Records'.'</th>';
$Result .= "\n".'<th>'.'Lower Records'.'</th>';
$Result .= "\n".'<th>'.'%Degree of Difficulty'.'</th>';
$Result .= "\n".'</tr>';
$r->print( $Result );
for ( my $nIdx = 0; $nIdx < $p_count; $nIdx++ ) {
my( $Pre, $Post ) = split(/\&/,$list[$nIdx]);
my ($Temp,$MxTries,$StdNo,$TotalTries,$YES,$Override,
$Wrng,$Avg,$SD,$Sk,$DoD,$res,$Prob)=split(/\:/,$Post);
my ($UpDis,$UpNo)=split(/\:/,$Up{$Prob});
my ($LwDis,$LwNo)=split(/\:/,$Low{$Prob});
$UpNo = ($UpNo) ? $UpNo : 0;
$LwNo = ($LwNo) ? $LwNo : 0;
my $U_Dis = sprintf("%.4f", $UpDis)*100;
my $L_Dis = sprintf("%.4f", $LwDis)*100;
my $DisFac = $UpDis - $LwDis;
my $_Dis = sprintf("%.4f", $DisFac)*100;
$r->print( "\n".'<tr>'.
"\n".'<td>'.($nIdx+1).'</td>'.
"\n".'<td>'.$Temp.'</td>'.
"\n".'<td>'.$_Dis.'</td>'.
"\n".'<td>'.$U_Dis.'</td>'.
"\n".'<td>'.$L_Dis.'</td>'.
"\n".'<td>'.$UpNo.'</td>'.
"\n".'<td>'.$LwNo.'</td>'.
"\n".'<td>'.$DoD.'</td>'.
"\n".'</tr>' );
}
$r->print("\n".'</table>');
$r->rflush();
}
sub CreateDiscFac {
my $CacheDB = "/home/httpd/perl/tmp/$ENV{'user.name'}".
"_$ENV{'user.domain'}_$cid\_statistics.db";
my $CachDisFac = "/home/httpd/perl/tmp/$ENV{'user.name'}".
"_$ENV{'user.domain'}_$cid\_DiscFactor.db";
my $ptr='';
# $ptr .= '<br><b> Discrimination Criterion: </b>'."\n".
# '<select name="DisType"> <option '.$OpSelDis1.'> Total Numebr of Correct Answers </option>'."\n".
# '<option '.$OpSelDis2.'></option>Sum of Partial Awarded Credits / Total Number of Tries </select> '."\n";
$ptr .= '<br><input type="submit" name="sort" '.
'value="Recalculate Discrimintion Factor" />';
$r->print($ptr);
if ((-e "$CacheDB")&&
($ENV{'form.sort'} ne 'Recalculate Discrimintion Factor')) {
if (tie(%CachData,'GDBM_File',"$CacheDB",&GDBM_READER,0640)) {
tie(%DiscFac,'GDBM_File',$CachDisFac,&GDBM_READER,0640);
#&DiscriminationTable();
&Classify();
}
else {$r->print("Unable to tie hash to db file");}
}
else {
if (tie(%CachData,'GDBM_File',$CacheDB,&GDBM_WRCREAT,0640)) {
tie(%DiscFac,'GDBM_File',$CachDisFac,&GDBM_WRCREAT,0640);
foreach (keys %CachData) {delete $CachData{$_};}
foreach (keys %DiscFac) {delete $DiscFac{$_};}
$DiscFlag=1;
&Build_Statistics();
$DiscFlag=0;
&DiscriminationTable();
}
else {$r->print("Unable to tie hash to db file");}
}
untie(%CachData);
untie(%DiscFac);
}
# ------ Create different Student Report
sub StudentReport {
my ($sname,$sdom)=@_;
if ( $sname eq 'All Students' ) {
$r->print( '<h3><font color=blue>WARNING:
Please select a student</font></h3>' );
return;
}
my $shome=&Apache::lonnet::homeserver( $sname,$sdom );
my $reply=&Apache::lonnet::reply('dump:'.$sdom.':'.$sname.':'.$cid,$shome );
my %result = ();
my $ResId;
my $Code;
my $Tries;
my $TotalTries = 0;
my $ParCr = 0;
my $Wrongs;
my %TempHash;
my $Version;
my $LatestVersion;
my $PtrTry='';
my $PtrCod='';
my $SetNo=0;
my $Str = "\n".'<table border=2>'.
"\n".'<tr>'.
"\n".'<th> # </th>'.
"\n".'<th> Set Title </th>'.
"\n".'<th> Results </th>'.
"\n".'<th> Tries </th>'.
"\n".'</tr>';
unless ($reply=~/^error\:/) {
map {
my ($name,$value)=split(/\=/,&Apache::lonnet::unescape($_));
$result{$name}=$value;
} split(/\&/,$reply);;
foreach $ResId (@cols) {
if ( !$ResId ) {
my $Set=&Apache::lonnet::declutter($hash{'map_id_'.$1});
if ( $Set ) {
$SetNo++;
$Str .= "\n"."<tr>".
"\n"."<td> $SetNo </td>".
"\n"."<td> $Set </td>".
"\n"."<td> $PtrCod </td>".
"\n"."<td> $PtrTry</td>".
"\n"."</tr>";
}
$PtrTry='';
$PtrCod='';
next;
}
$ResId=~/(\d+)\.(\d+)/;
my $Map = &Apache::lonnet::declutter( $hash{'map_id_'.$1} );
if ( $CurMap ne 'All Maps' ) {
my ( $ResMap, $NameMap ) = split(/\=/,$CurMap);
if ( $Map ne $ResMap ) { next; }
}
my $meta=$hash{'src_'.$ResId};
my $PartNo = 0;
undef %TempHash;
map {
if ($_=~/^stores\_(\d+)\_tries$/) {
my $Part=&Apache::lonnet::metadata($meta,$_.'.part');
if ( $TempHash{"$Part"} eq '' ) {
$TempHash{"$Part"} = $Part;
$TempHash{$PartNo}=$Part;
$TempHash{"$Part.Code"} = '-';
$PartNo++;
}
}
} split(/\,/,&Apache::lonnet::metadata($meta,'keys'));
my $Prob = $Map.'___'.$2.'___'.
&Apache::lonnet::declutter( $hash{'src_'.$ResId} );
$Code='U';
$Tries = 0;
$Wrongs = 0;
$LatestVersion = $result{"version:$Prob"};
if ( $LatestVersion ) {
for ( my $Version=1; $Version<=$LatestVersion; $Version++ ) {
my $vkeys = $result{"$Version:keys:$Prob"};
my @keys = split(/\:/,$vkeys);
foreach my $Key (@keys) {
if (($Key=~/\.(\w+)\.solved$/) && ($Key!~/^\d+\:/)) {
my $Part = $1;
$Tries = $result{"$Version:$Prob:resource.$Part.tries"};
$TempHash{"$Part.Tries"} = ($Tries) ? $Tries : 0;
$TotalTries += $Tries;
my $Val = $result{"$Version:$Prob:resource.$Part.solved"};
if ( $Val eq 'correct_by_student' )
{ $Wrongs = $Tries - 1; $Code = 'Y'; }
elsif ( $Val eq 'correct_by_override' )
{ $Wrongs = $Tries - 1; $Code = 'y'; }
elsif ( $Val eq 'incorrect_attempted' ||
$Val eq 'incorrect_by_override' )
{ $Wrongs = $Tries; $Code = 'N'; }
$TempHash{"$Part.Code"} = $Code;
$TempHash{"$Part.Wrongs"} = $Wrongs;
}
}
}
for ( my $n = 0; $n < $PartNo; $n++ ) {
my $part = $TempHash{$n};
if ($PtrTry ne '') {$PtrTry .= ',';}
$PtrTry .= "$TempHash{$part.'.Tries'}";
$PtrCod .= "$TempHash{$part.'.Code'}";
}
}
else {
for(my $n=0; $n<$PartNo; $n++) {
if ($PtrTry ne '') {$PtrTry .= ',';}
$PtrTry .= "0";
$PtrCod .= "-";
}
}
}
}
$Str .= "\n".'</table>';
$r->print($Str);
$r->rflush();
}
# ------------------------------------------- Prepare Statistics Table
sub PreStatTable {
my $CacheDB = "/home/httpd/perl/tmp/$ENV{'user.name'}".
"_$ENV{'user.domain'}_$cid\_statistics.db";
my $GraphDB = "/home/httpd/perl/tmp/$ENV{'user.name'}".
"_$ENV{'user.domain'}_$cid\_graph.db";
my $CachDisFac = "/home/httpd/perl/tmp/$ENV{'user.name'}".
"_$ENV{'user.domain'}_$cid\_DiscFactor.db";
$r->print('<br><input type="submit" name="sort" value="Recalculate Statistics" />');
my $Ptr = '';
$Ptr .= '<br><b> Sorting Type: </b>'."\n".
'<select name="order"> <option '.$OpSel1.' >Ascending</option>'."\n".
'<option '.$OpSel2.'>Descending</option> </select> '."\n";
$Ptr .= ' ';
$Ptr .= '<input type="submit" name="sort" value="DoDiff Graph" />'."\n";
$Ptr .= ' ';
$Ptr .= '<input type="submit" name="sort" value="%Wrong Graph" />'."\n";
$Ptr .= '<pre>'.
' #Stdnts: Total Number of Students opened the problem.<br>'.
' Tries : Total Number of Tries for solving the problem.<br>'.
' Mod : Maximunm Number of Tries for solving the problem.<br>'.
' Mean : Average Number of the tries. [ Tries / #Stdns ]<br>'.
' #YES : Number of students solved the problem correctly.<br>'.
' #yes : Number of students solved the problem by override.<br>'.
' %Wrng : Percentage of students tried to solve the problem but'.
' still incorrect. [ 100*((#Stdnts-(#YES+#yes))/#Stdnts) ]<br>'.
' S.D. : Standard Deviation of the tries.'.
'[ sqrt(sum((Xi - Mean)^2)) / (#Stdnts-1)'.
' where Xi is every student\'s tries ]<br>'.
' Skew. : Skewness of the students tries.'.
' [ (sqrt( sum((Xi - Mean)^3) / #Stdnts)) / (S.D.^3) ]<br>'.
# ' DoDiff : Degree of Difficulty of the problem. [ Tries/(#YES+#yes+0.1) ]<br>'.
' DoDiff : Degree of Difficulty of the problem. [ 1 - ((#YES+#yes) / Tries) ]<br>'.
# ' Dis.F. : Discrimination Factor. [ Sum of Partial Credits Awarded / Total Number of Tries in %27 upper and lower students]</b>'.
'</pre>';
$r->print($Ptr);
$r->rflush();
my $Result = "\n".'<table border=2>';
$Result .= '<tr><th>P#</th>'."\n";
for ( my $nIdx=0; $nIdx < 12; $nIdx++ ) {
$Result .= '<th>'.'<input type="submit" name="sort" value="'.
$Header{$nIdx}.'" />'.'</th>'."\n";
}
$Result .= "\n".'</tr>'."\n";
$r->print( $Result );
$r->rflush();
if ((-e "$CacheDB")&&($ENV{'form.sort'} ne 'Recalculate Statistics')) {
if (tie(%CachData,'GDBM_File',"$CacheDB",&GDBM_READER,0640)) {
tie(%GraphDat,'GDBM_File',$GraphDB,&GDBM_WRCREAT,0640);
&Cache_Statistics();
}
else {
$r->print("Unable to tie hash to db file");
}
}
else {
if (tie(%CachData,'GDBM_File',$CacheDB,&GDBM_WRCREAT,0640)) {
tie(%DiscFac,'GDBM_File',$CachDisFac,&GDBM_WRCREAT,0640);
tie(%GraphDat,'GDBM_File',$GraphDB,&GDBM_WRCREAT,0640);
foreach (keys %DiscFac) {delete $CachData{$_};}
foreach (keys %CachData) {delete $CachData{$_};}
$DiscFlag=0;
&Build_Statistics();
}
else {
$r->print("Unable to tie hash to db file");
}
}
#$r->print('Total instances of the problems : '.($p_count*($#students+1)));
untie(%CachData);
untie(%GraphDat);
untie(%DiscFac);
$r->print("\n".'</table>'."\n");
$r->rflush();
}
# ------------------------------------- Find the section of student in a course
sub usection {
my ($udom,$unam,$courseid)=@_;
$courseid=~s/\_/\//g;
$courseid=~s/^(\w)/\/$1/;
map {
my ($key,$value)=split(/\=/,$_);
$key=&Apache::lonnet::unescape($key);
if ($key=~/^$courseid(?:\/)*(\w+)*\_st$/) {
my $section=$1;
if ($key eq $courseid.'_st') { $section=''; }
my ($dummy,$end,$start)=split(/\_/,&Apache::lonnet::unescape($value));
$section=($section) ? $section : '(none)';
$section=(int($section)) ? int($section) : $section;
# $r->print($unam.'...'.$section.'<br>');
return $section;
}
} split(/\&/,&Apache::lonnet::reply('dump:'.$udom.':'.$unam.':roles',
&Apache::lonnet::homeserver($unam,$udom)));
return '';
}
# ------ Dump the Student's DB file and handling the data for statistics table
sub ExtractStudentData {
my ($student,$coid)=@_;
my ($sname,$sdom) = split( /\:/, $student );
my $shome=&Apache::lonnet::homeserver( $sname,$sdom );
my $reply=&Apache::lonnet::reply('dump:'.$sdom.':'.$sname.':'.$coid,$shome );
my %result = ();
my $ResId;
my $Dis = '';
my $Code;
my $Tries;
my $ParCr;
my $TotalTries = 0;
my $TotalOpend = 0;
my $ProbSolved = 0;
my $ProbTot = 0;
my $TimeTot = 0;
my $TotParCr = 0;
my $Wrongs;
my %TempHash;
my $Version;
my $LatestVersion;
my $SecLimit;
my $MapLimit;
unless ($reply=~/^error\:/) {
map {
my ($name,$value)=split(/\=/,&Apache::lonnet::unescape($_));
$result{$name}=$value;
#$r->print($name.'='.$value.'<br>');
} split(/\&/,$reply);
foreach $ResId (@cols) {
if ( !$ResId ) { next; }
$ResId=~/(\d+)\.(\d+)/;
my $Map = &Apache::lonnet::declutter( $hash{'map_id_'.$1} );
if ( $CurMap ne 'All Maps' ) {
my ( $ResMap, $NameMap ) = split(/\=/,$CurMap);
if ( $Map ne $ResMap ) { next; }
}
my $meta=$hash{'src_'.$ResId};
my $PartNo = 0;
$Dis .= ':';
undef %TempHash;
map {
if ($_=~/^stores\_(\d+)\_tries$/) {
my $Part=&Apache::lonnet::metadata($meta,$_.'.part');
if ( $TempHash{"$Part"} eq '' ) {
$TempHash{"$Part"} = $Part;
$TempHash{$PartNo}=$Part;
$TempHash{"$Part.Code"} = 'U';
$PartNo++;
}
}
} split(/\,/,&Apache::lonnet::metadata($meta,'keys'));
my $Prob = $Map.'___'.$2.'___'.
&Apache::lonnet::declutter( $hash{'src_'.$ResId} );
$Code='U';
$Tries = 0;
$ParCr = 0;
$Wrongs = 0;
$LatestVersion = $result{"version:$Prob"};
if ( $LatestVersion ) {
for ( my $Version=1; $Version<=$LatestVersion; $Version++ ) {
my $vkeys = $result{"$Version:keys:$Prob"};
my @keys = split(/\:/,$vkeys);
foreach my $Key (@keys) {
if (($Key=~/\.(\w+)\.solved$/) && ($Key!~/^\d+\:/)) {
my $Part = $1;
$Tries = $result{"$Version:$Prob:resource.$Part.tries"};
$ParCr = $result{"$Version:$Prob:resource.$Part.awarded"};
my $Time = $result{"$Version:$Prob:timestamp"};
$TempHash{"$Part.Time"} = ($Time) ? $Time : 0;
$TempHash{"$Part.Tries"} = ($Tries) ? $Tries : 0;
$TempHash{"$Part.ParCr"} = ($ParCr) ? $ParCr : 0;
$TotalTries += $TempHash{"$Part.Tries"};
$TotParCr += $TempHash{"$Part.ParCr"};
#$r->print($Version.'---'.$Prob.'==='.$Time.'<br>');
my $Val = $result{"$Version:$Prob:resource.$Part.solved"};
if ( $Val eq 'correct_by_student' )
{ $Wrongs = $Tries - 1; $Code = 'C'; }
elsif ( $Val eq 'correct_by_override' )
{ $Wrongs = $Tries - 1; $Code = 'O'; }
elsif ( $Val eq 'incorrect_attempted' ||
$Val eq 'incorrect_by_override' )
{ $Wrongs = $Tries; $Code = 'I'; }
$TempHash{"$Part.Code"} = $Code;
$TempHash{"$Part.Wrongs"} = $Wrongs;
}
}
}
for ( my $n = 0; $n < $PartNo; $n++ ) {
my $part = $TempHash{$n};
my $Yes = 0;
if ( $TempHash{$part.'.Code'} eq 'C' ||
$TempHash{$part.'.Code'} eq 'O' )
{$ProbSolved++;$Yes=1;}
my $ptr = "$hash{'title_'.$ResId}";
if ( $PartNo > 1 ) {
$ptr .= " (part $part)";
$Dis .= ':';
}
my $Fac = ($TempHash{"$part.Tries"}) ?
($TempHash{"$part.ParCr"}/$TempHash{"$part.Tries"}) : 0;
my $DisF;
if ( $Fac > 0 && $Fac < 1 ) {
$DisF = sprintf( "%.4f", $Fac );
}
else {$DisF = $Fac;}
# $DisF .= '+'.$TempHash{"$part.Time"};
$TimeTot += $TempHash{"$part.Time"};
$Dis .= $ptr.'*'.$ResId.'='.$DisF.'+'.$Yes;
$ptr .= "*$ResId:$TempHash{$part.'.Tries'}".
":$TempHash{$part.'.Wrongs'}".
":$TempHash{$part.'.Code'}";
#$r->print($sname.' -- '.$ptr.'--- timestamp='.$TempHash{"$part.Time"}.'<br>');
push (@list, $ptr);
$TotalOpend++;
$ProbTot++;
}
}
else {
for(my $n=0; $n<$PartNo; $n++) {
push (@list, "$hash{'title_'.$ResId}*$ResId:0:0:U");
$ProbTot++;
}
}
}
if ( $TotalTries ) {
my $DisFac = ( $TotalTries ) ? ($TotParCr/$TotalTries) : 0;
# my $DisFactor = int(sprintf( "%.4f", $DisFac ) * 100);
my $DisFactor = sprintf( "%.4f", $DisFac );
my $time;
if ($ProbSolved){
$time = int(($TimeTot/$ProbSolved)/10000000);
}
$DiscFac{($DisFactor.':'.$sname.':'.$ProbTot.':'.$TotalOpend.':'.
$TotalTries.':'.$ProbSolved.':'.$time)}=$Dis;
#$r->print($DisFactor.$sname.'<br> --- Dis= '.$Dis.'<br>');
}
}
#$r->print($sname.' PrCr= '.$TotParCr.' Slvd= '.$ProbSolved.' Tries='.$TotalTries.'<br>');
}
# ------------------------------------------------------------ Build page table
sub tracetable {
my ($rid,$beenhere)=@_;
$rid=~/(\d+)\.(\d+)/;
$maps{&Apache::lonnet::declutter($hash{'map_id_'.$1})}='';#$hash{'title_'.$rid};
unless ($beenhere=~/\&$rid\&/) {
$beenhere.=$rid.'&';
if (defined($hash{'is_map_'.$rid})) {
my $cmap=$hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$rid}}};
if ( $cmap eq 'sequence' || $cmap eq 'page' ) {
$cols[$#cols+1]=0;
$HWN++;
$mapsort[$HWN]=$rid.$hash{'title_'.$rid};
#$maps{&Apache::lonnet::declutter($hash{'src_'.$rid})}=
# $hash{'title_'.$rid};
}
if ((defined($hash{'map_start_'.$hash{'src_'.$rid}})) &&
(defined($hash{'map_finish_'.$hash{'src_'.$rid}}))) {
my $frid=$hash{'map_finish_'.$hash{'src_'.$rid}};
&tracetable($hash{'map_start_'.$hash{'src_'.$rid}},
'&'.$frid.'&');
if ($hash{'src_'.$frid}) {
if ($hash{'src_'.$frid}=~
/\.(problem|exam|quiz|assess|survey|form)$/) {
$cols[$#cols+1]=$frid;
$mapsort[$HWN] .= '&'.$frid;
}
}
}
} else {
if ($hash{'src_'.$rid}) {
if ($hash{'src_'.$rid}=~
/\.(problem|exam|quiz|assess|survey|form)$/) {
$cols[$#cols+1]=$rid;
$mapsort[$HWN] .= '&'.$rid;
}
}
}
if (defined($hash{'to_'.$rid})) {
map {
&tracetable($hash{'goesto_'.$_},$beenhere);
} split(/\,/,$hash{'to_'.$rid});
}
}
}
sub MySort {
if ( $Pos > 0 && $Pos < 11 ) {
if ($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 Build_Statistics {
$r->print(<<ENDPOP);
<script>
popwin=open('','popwin','width=400,height=100');
popwin.document.writeln('<html><body bgcolor="#8cee8c">'+
'<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();
# ---------------------------- Gathering the Data of students' tries
my $index;
for ($index=0;$index<=$#students;$index++) {
#----------- update progress
$r->print('<script>popwin.document.popremain.remaining.value="'.
'Computing '.($index+1).'/'.($#students+1).': '.
$students[$index].'";</script>');
$r->rflush();
&ExtractStudentData($students[$index],$cid);
}
#--------------------- close Progress Line
$r->print('<script>popwin.close()</script>');
$r->rflush();
# -------------------- sorting the Data
@list = sort(@list);
$OpSel2='';
$OpSel1='selected';
$p_count = 0;
my $nIdx = 0;
my $dummy;
my $p_val;
my $ResId;
my $NoElements = $#list + 1;
#-------------------------------- loop for data representation
while ( $nIdx < $NoElements ) {
my %storestats=();
my ($Prob,$Tries,$Wrongs,$Code)=split(/\:/,$list[$nIdx]);
my $Temp = $Prob;
my $MxTries = 0;
my $TotalTries = 0;
my $YES = 0;
my $Incorrect = 0;
my $Override = 0;
my $StdNo = 0;
my @StdLst;
do {
$nIdx++;
$StdNo++;
$StdLst[ $StdNo ] = $Tries;
$TotalTries += $Tries;
if ( $MxTries < $Tries ) { $MxTries = $Tries; }
if ( $Code eq 'C' ){ $YES++; }
elsif( $Code eq 'I' ) { $Incorrect++; }
elsif( $Code eq 'O' ) { $Override++; }
elsif( $Code eq 'U' ) { $StdNo--; }
($Prob,$Tries,$Wrongs,$Code)=split(/\:/,$list[$nIdx]);
} while ( $Prob eq $Temp && $nIdx < $NoElements );
$p_count++;
($Temp,$ResId)=split(/\*/,$Temp);
$Temp = '<a href="'.$hash{'src_'.$ResId}.'" target="_blank">'.$Temp.'</a>';
my $res = &Apache::lonnet::declutter($hash{'src_'.$ResId});
my $urlres=$res;
$ResId=~/(\d+)\.(\d+)/;
my $Map = &Apache::lonnet::declutter( $hash{'map_id_'.$1} );
$urlres=$Map;
$res = '<a href="'.$hash{'src_'.$ResId}.'">'.$res.'</a>';
#$Map = '<a href="'.$Map.'">'.$res.'</a>';
#------------------------ Compute the Average of Tries about one problem
my $Average = ($StdNo) ? $TotalTries/$StdNo : 0;
$storestats{$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;
#-------------------------------- Compute Standard Deviation
my $StdDev = 0;
if ( $StdNo > 1 ) {
for ( my $n = 0; $n < $StdNo; $n++ ) {
my $Dif = $StdLst[ $n ]-$Average;
$StdDev += $Dif*$Dif;
}
$StdDev /= ( $StdNo - 1 );
$StdDev = sqrt( $StdDev );
}
#-------------------------------- Compute Degree of Difficulty
my $DoDiff = 0;
if( $TotalTries > 0 ) {
$DoDiff = 1 - ( ( $YES + $Override ) / $TotalTries );
# $DoDiff = ($TotalTries)/($YES + $Override+ 0.1);
}
$storestats{$ENV{'request.course.id'}.'___'.$urlres.'___difficulty'}=$DoDiff;
#-------------------------------- Compute the Skewness
my $Skewness = 0;
my $Sum = 0;
if ( $StdNo > 0 && $StdDev > 0 ) {
for ( my $n = 0; $n < $StdNo; $n++ ) {
my $Dif = $StdLst[ $n ]-$Average;
$Skewness += $Dif*$Dif*$Dif;
}
$Skewness /= $StdNo;
$Skewness /= $StdDev*$StdDev*$StdDev;
}
#----------------- Some restition in presenting the float numbers
my $Avg = sprintf( "%.2f", $Average );
my $Wrng = sprintf( "%.1f", $Wrong );
my $SD = sprintf( "%.1f", $StdDev );
my $DoD = sprintf( "%.2f", $DoDiff );
my $Sk = sprintf( "%.1f", $Skewness );
$CachData{($p_count-1)}=$Temp.':'.$StdNo.':'.$TotalTries.':'.
$MxTries.':'.$Avg.':'.$YES.':'.
$Override.':'.$Wrng.':'.$SD.':'.
$Sk.':'.$DoD.':'.$Map.':'.$Prob;
$urlres=~/^(\w+)\/(\w+)/;
if ($StdNo) {
&Apache::lonnet::put('resevaldata',\%storestats,$1,$2);
}
#-------------------------------- Row of statistical table
if ( $DiscFlag == 0 ) {
$r->print( "\n".'<tr>'.
"\n".'<td>'.$p_count.'</td>'.
"\n".'<td>'.$Temp.'</td>'.
"\n".'<td>'.$StdNo.'</td>'.
"\n".'<td>'.$TotalTries.'</td>'.
"\n".'<td>'.$MxTries.'</td>'.
"\n".'<td>'.$Avg.'</td>'.
"\n".'<td>'.$YES.'</td>'.
"\n".'<td>'.$Override.'</td>'.
"\n".'<td>'.$Wrng.'</td>'.
"\n".'<td>'.$SD.'</td>'.
"\n".'<td>'.$Sk.'</td>'.
"\n".'<td>'.$DoD.'</td>'.
"\n".'<td>'.$Map.'</td>'.
"\n".'</tr>' );
$GraphDat{$nIdx}=$DoD.':'.$Wrng;
}
}
}
sub Cache_Statistics {
my @list = ();
my $Useful;
my $UnUseful;
my %myHeader = reverse( %Header );
$Pos = $myHeader{$ENV{'form.sort'}};
$p_count = 0;
foreach my $key( keys %CachData) {
my @Temp=split(/\:/,$CachData{$key});
if ( $Pos == 0 || $Pos == 11 ) {
($UnUseful,$Useful)=split(/\>/,$Temp[$Pos]);
}
else {
$Useful = $Temp[$Pos];
}
$list[$p_count]=$Useful.'&'.$CachData{$key};
$p_count++;
}
@list = sort MySort (@list);
for ( my $nIdx = 0; $nIdx < $p_count; $nIdx++ ) {
my( $Pre, $Post ) = split(/\&/,$list[$nIdx]);
my ($Temp,$StdNo,$TotalTries,$MxTries,$Avg,$YES,
$Override,$Wrng,$SD,$Sk,$DoD,$res,$Prob)=split(/\:/,$Post);
$r->print( "\n".'<tr>'.
"\n".'<td>'.($nIdx+1).'</td>'.
"\n".'<td bgcolor="#FFFFFF">'.$Temp.'</td>'.
"\n".'<td>'.$StdNo.'</td>'.
"\n".'<td>'.$TotalTries.'</td>'.
"\n".'<td>'.$MxTries.'</td>'.
"\n".'<td>'.$Avg.'</td>'.
"\n".'<td>'.$YES.'</td>'.
"\n".'<td>'.$Override.'</td>'.
"\n".'<td>'.$Wrng.'</td>'.
"\n".'<td>'.$SD.'</td>'.
"\n".'<td>'.$Sk.'</td>'.
"\n".'<td>'.$DoD.'</td>'.
"\n".'<td>'.$res.'</td>'.
"\n".'</tr>' );
$GraphDat{$nIdx}=$DoD.':'.$Wrng;
}
}
# ------------------------------------------- Prepare data for Graphical chart
sub GetGraphData {
my $Tag = shift;
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 ( $Tag eq 'DoDiff Graph' ) {
$Tag = 'Degree-of-Difficulty';
$Col = 0;
}
else {
$Tag = '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++;
}
untie(%GraphDat);
my $Course = $ENV{'course.'.$cid.'.description'};
$Course =~ s/\ /"_"/eg;
$GData=$Course.'&'.$Tag.'&'.$Max.'&'.$count.'&'.$data;
}
else {
$r->print("Unable to tie hash to db file");
}
}
}
sub initial {
# --------------------------------- Initialize the global varaibles
undef @students;
undef @cols;
undef %maps;
undef %section;
undef %StuBox;
undef @list;
undef %CachData;
undef %GraphDat;
undef %DiscFac;
undef $CurMap;
undef $CurSec;
undef $CurStu;
undef $p_count;
undef $Pos;
undef $GData;
}
sub ClassList {
&GetStatus();
$cid=$ENV{'request.course.id'};
my $chome=$ENV{'course.'.$cid.'.home'};
my ($cdom,$cnum)=split(/\_/,$cid);
# ----------------------- Get first and last resource, see if there is anything
$firstres=$hash{'map_start_/res/'.$ENV{'request.course.uri'}};
$lastres=$hash{'map_finish_/res/'.$ENV{'request.course.uri'}};
if (($firstres) && ($lastres)) {
# ----------------------------------------------------------------- Render page
my $classlst=&Apache::lonnet::reply
('dump:'.$cdom.':'.$cnum.':classlist',$chome);
my $StudNo = 0;
unless ($classlst=~/^error\:/) {
foreach (sort split(/\&/,$classlst)) {
my ($name,$value)=split(/\=/,$_);
my ($end,$start)=split(/\:/,&Apache::lonnet::unescape($value));
$name=&Apache::lonnet::unescape($name);
my ($sname,$sdom)=split(/\:/,$name);
my $ssec=&Apache::lonnet::usection($sdom,$sname,$cid);
if ($ssec==-1) {next;}
$ssec=($ssec) ? $ssec : '(none)';
$ssec=(int($ssec)) ? int($ssec) : $ssec;
#$r->print($sname.'...'.$ssec.'<br>');
$section{$ssec}=$ssec;
if ($CurSec eq 'All Sections' || $ssec eq $CurSec) {
$students[$StudNo]=$name;
$StuBox{$sname}=$ssec;
}
$StudNo++;
}
}
else {
$r->print('<h1>Could not access course data</h1>');
}
$r->print("Total number of students : ".($#students+1));
$r->rflush();
# --------------- Find all assessments and put them into some linear-like order
&tracetable($firstres,'&'.$lastres.'&');
#my $c=0;
#foreach(@mapsort) {
# $c++;
# $r->print('<br>'.$mapsort[$c]);
#}
#$r->print('<br> Count = '.$c);
}
# ------------------------------------------------------------- End render page
else {
$r->print('<h3>Undefined course sequence</h3>');
}
&MapSecOptions();
}
sub Menu {
my $InpStr = $ENV{'form.sort'};
if ( $InpStr eq 'DoDiff Graph' || $InpStr eq '%Wrong Graph' ) {
&GetGraphData($InpStr);
$r->print('<IMG src="/cgi-bin/graph.gif?'.$GData.'" />');
}
else {
$r->print('<html><head><title>LON-CAPA Statistics</title></head>');
$r->print('<body bgcolor="#FFFFFF">'.
'<script>window.focus(); window.width=500;window.height=500; </script>'.
'<img align=right src=/adm/lonIcons/lonlogos.gif>');
# ---------------------------------------------------------------- Course title
$r->print('<h1> Course : "'.
$ENV{'course.'.$ENV{'request.course.id'}.
'.description'}.'"</h1><h2>'.localtime().'</h2>');
# ------------------------------- This is going to take a while, produce output
$r->rflush();
$r->print("\n".'<form name=stat method=post action="/adm/statistics" >');
my $content = $ENV{'form.sort'};
if ($content eq '' || $content eq 'Return to Menu') {
my $Ptr = '<h3>';
$Ptr .= '<input type=submit name=sort value="Problem Evaluation"/>';#General Statistics"/>';
$Ptr .= '<br><br>';
$Ptr .= '<input type=submit name=sort value="Student Assessment"/>';
$Ptr .= '<br><br>';
# $Ptr .= '<input type=submit name=sort value=Discrimination>';#"Problem Evaluation"/>';
$Ptr .= '</h3>';
$r->print( $Ptr );
}
else {
&initial();
&ClassList();
if ( $content eq 'Discrimination' || #'Problem Evaluation' ||
$content eq 'Recalculate Discrimintion Factor' ) {
&CreateDiscFac();
}
elsif ( $content eq 'Student Assessment' ||
$content eq 'Create Student Report' ) {
&StudentOptions();
&StudentReport($CurStu,$StuBox{"$CurStu"});
}
else {
&PreStatTable();
}
}
$r->print("\n".'</form>'.
"\n".'</body>'.
"\n".'</html>');
$r->rflush();
}
}
sub StudentOptions {
my $OpSel5='';
$CurStu = $ENV{'form.student'};
if ( $CurStu eq '' ) {
$CurStu = 'All Students';
$OpSel5 = 'selected';
}
my $Ptr ='';
# ----------------------------------- Loading the Students Combobox
$Ptr .= '<br><b>Select Student</b>'."\n".
'<select name="student">'."\n".
'<option '.$OpSel5.'>All Students</option>';
foreach my $key ( sort keys %StuBox ) {
$Ptr .= '<option';
if ($CurStu eq $key) {$Ptr .= ' selected';}
$Ptr .= '>'.$key."</option>\n";
}
$Ptr .= '</select>';
$Ptr .= '<br><input type="submit" name="sort" value="Create Student Report" />';
$r->print( $Ptr );
$r->rflush();
}
sub GetStatus {
$OpSelDis1='';
$OpSelDis2='';
$OpSel1='';
$OpSel2='';
$OpSel3='';
$OpSel4='';
# if ( $ENV{'form.DisType'} eq 'Total Number of Correct Answers' ) {
# $OpSelDis1='selected';
# $CurDis=0;
# }
# else { $OpSel2 = 'selected'; $CurDis = 1;}
if ( $ENV{'form.order'} eq 'Descending' ) { $OpSel2='selected'; }
else { $OpSel1 = 'selected'; }
$CurMap = $ENV{'form.maps'};
if ( $CurMap eq '' ) {
$CurMap = 'All Maps';
$OpSel3 = 'selected';
}
$CurSec = $ENV{'form.section'};
if ( $CurSec eq '' ) {
$CurSec = 'All Sections';
$OpSel4 = 'selected';
}
}
sub MapSecOptions {
# ----------------------------------- Loading the Maps Combobox
my $Ptr = '<br>';
$Ptr .= '<br><input type="submit" name="sort" value="Return to Menu" />';
$Ptr .= '<br><b> Select Map </b>'."\n".
'<select name="maps">'."\n".
'<option '.$OpSel3.'>All Maps</option>';
foreach my $key ( sort keys %maps ) {
$Ptr .= '<option';
if ($CurMap eq $key) {$Ptr .= ' selected';}
$Ptr .= '>'.$key."</option>\n";
}
$Ptr .= '</select>';
$Ptr .= ' ';
# ----------------------------------- Loading the Sections Combobox
$Ptr .= '<br><b>Select Section</b>'."\n".
'<select name="section">'."\n".
'<option '.$OpSel4.'>All Sections</option>';
foreach my $key ( sort keys %section ) {
$Ptr .= '<option';
if ($CurSec eq $key) {$Ptr .= ' selected';}
$Ptr .= '>'.$key."</option>"."\n";
}
$Ptr .= '</select>'."\n";
$r->print( $Ptr );
$r->rflush();
}
# ================================================================ Main Handler
sub handler {
$r=shift;
if (&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'})) {
# ------------------------------------------- Set document type for header only
if ($r->header_only) {
if ($ENV{'browser.mathml'}) {
$r->content_type('text/xml');
}
else {
$r->content_type('text/html');
}
$r->send_http_header;
return OK;
}
my $requrl=$r->uri;
# ----------------------------------------------------------------- Tie db file
undef %hash;
if ($ENV{'request.course.fn'}) {
my $fn=$ENV{'request.course.fn'};
if (-e "$fn.db") {
if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER,0640)) {
# ------------------------------------------------------------------- Hash tied
$r->content_type('text/html');
$r->send_http_header;
&Menu();
}
else {
$r->content_type('text/html');
$r->send_http_header;
$r->print('<html><body>Coursemap undefined.</body></html>');
}
# ------------------------------------------------------------------ Untie hash
unless (untie(%hash)) {
&Apache::lonnet::logthis("<font color=blue>WARNING: ".
"Could not untie coursemap $fn (browse).</font>");
}
# -------------------------------------------------------------------- All done
return OK;
# ----------------------------------------------- Errors, hash could no be tied
}
}
else {
$ENV{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
return HTTP_NOT_ACCEPTABLE;
}
}
else {
$ENV{'user.error.msg'}=
$r->uri.":vgr:0:0:Cannot view grades for complete course";
return HTTP_NOT_ACCEPTABLE;
}
}
1;
__END__
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