--- loncom/interface/spreadsheet/studentcalc.pm	2003/08/01 13:33:41	1.16
+++ loncom/interface/spreadsheet/studentcalc.pm	2003/09/05 01:06:45	1.17
@@ -1,5 +1,5 @@
 #
-# $Id: studentcalc.pm,v 1.16 2003/08/01 13:33:41 matthew Exp $
+# $Id: studentcalc.pm,v 1.17 2003/09/05 01:06:45 matthew Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -45,6 +45,9 @@ studentcalc
 ###################################################
 package Apache::studentcalc;
 
+use warnings FATAL=>'all';
+no warnings 'uninitialized';
+
 use strict;
 use Apache::Constants qw(:common :http);
 use Apache::lonnet;
@@ -98,8 +101,8 @@ sub initialize_sequence_cache {
 }
 
 sub clear_package {
-    @Sequences = undef;
-    %Exportrows = undef;
+    undef(@Sequences);
+    undef(%Exportrows);
 }
 
 sub get_title {
@@ -493,7 +496,7 @@ sub compute {
 sub set_row_sources {
     my $self = shift;
     while (my ($cell,$value) = each(%{$self->{'formulas'}})) {
-        next if ($cell !~ /^A(\d+)/ && $1 > 0);
+        next if ($cell !~ /^A(\d+)$/ || $1 < 1);
         my $row = $1;
         (undef,$value) = split('__&&&__',$value);
         $value = 'Default' if (! defined($value));
@@ -510,7 +513,7 @@ sub set_row_numbers {
         next if ($row == 0);
         my ($symb,undef) = split('__&&&__',$formula);
         $self->{'row_numbers'}->{$symb} = $row;
-        $self->{'maxrow'} = $1 if ($1 > $self->{'maxrow'});
+        $self->{'maxrow'} = $row if ($row > $self->{'maxrow'});
     }
 }
 
@@ -540,7 +543,7 @@ These rows are saved in the courses dire
 #############################################
 #############################################
 sub load_cached_export_rows {
-    %Exportrows = undef;
+    undef(%Exportrows);
     my @tmp = &Apache::lonnet::dump('nohist_calculatedsheets',
 		     $ENV{'course.'.$ENV{'request.course.id'}.'.domain'},
 		     $ENV{'course.'.$ENV{'request.course.id'}.'.num'},undef);