version 1.23, 2001/05/30 21:49:13
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version 1.25, 2001/05/31 22:36:18
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# file name (temp): default_homework |
# file name (temp): default_homework |
# used by lonxml::xmlparse() as input variable $safeinit to Apache::run::run() |
# used by lonxml::xmlparse() as input variable $safeinit to Apache::run::run() |
# |
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# |
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#init some globals |
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# |
# |
# Guy Albertelli |
# Guy Albertelli |
# |
# |
# 05/25/2001 H. K. Ng |
# 05/25/2001 H. K. Ng |
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# 05/31/2001 H. K. Ng |
# |
# |
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#init some globals |
$RANDOMINIT=0; |
$RANDOMINIT=0; |
$pi=atan2(1,1)*4; |
$pi=atan2(1,1)*4; |
$rad2deg=180.0/$pi; |
$rad2deg=180.0/$pi; |
Line 123 sub tex {
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Line 122 sub tex {
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} |
} |
} |
} |
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sub var_in_tex { |
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if ( $external::target eq "tex" ) { |
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return @_[0]; |
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} else { |
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return ""; |
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} |
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} |
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sub web { |
sub web { |
if ( $external::target eq "tex" ) { |
if ( $external::target eq "tex" ) { |
return @_[1]; |
return @_[1]; |
Line 135 sub web {
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Line 142 sub web {
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} |
} |
} |
} |
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sub html { |
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if ( $external::target eq "web" ) { |
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return @_[0]; |
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} |
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} |
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sub problem { |
sub problem { |
return '1'; |
return '1'; |
} |
} |
Line 193 sub max {
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Line 206 sub max {
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return pop @sorted; |
return pop @sorted; |
} |
} |
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sub html { |
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if ( $external::target eq "web" ) { |
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return @_[0]; |
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} |
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} |
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sub roundto { |
sub roundto { |
my ($input,$n) = @_; |
my ($input,$n) = @_; |
return sprintf('%.'.$n.'f',$input); |
return sprintf('%.'.$n.'f',$input); |
Line 273 sub sec {
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Line 280 sub sec {
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sub open_date { |
sub open_date { |
my @dc = split(/\s+/,localtime(&EXT('resource.0.opendate'))); |
my @dc = split(/\s+/,localtime(&EXT('resource.0.opendate'))); |
return $dc[0].', '.$dc[1].' '.$dc[2].', '.$dc[4].' at '.$dc[3]; |
return '' if ($dc[0] eq "Wed" and $dc[2] == 31 and $dc[4] == 1969); |
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my @hm = split(/:/,$dc[3]); |
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my $ampm = " am"; |
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if ($hm[0] > 12) { |
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$hm[0]-=12; |
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$ampm = " pm"; |
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} |
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return $dc[0].', '.$dc[1].' '.$dc[2].', '.$dc[4].' at '.$hm[0].':'.$hm[1].$ampm; |
} |
} |
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sub due_date { |
sub due_date { |
my @dc = split(/\s+/,localtime(&EXT('resource.0.duedate'))); |
my @dc = split(/\s+/,localtime(&EXT('resource.0.duedate'))); |
return $dc[0].', '.$dc[1].' '.$dc[2].', '.$dc[4].' at '.$dc[3]; |
return '' if ($dc[0] eq "Wed" and $dc[2] == 31 and $dc[4] == 1969); |
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my @hm = split(/:/,$dc[3]); |
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my $ampm = " am"; |
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if ($hm[0] > 12) { |
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$hm[0]-=12; |
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$ampm = " pm"; |
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} |
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return $dc[0].', '.$dc[1].' '.$dc[2].', '.$dc[4].' at '.$hm[0].':'.$hm[1].$ampm; |
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# return $dc[0].', '.$dc[1].' '.$dc[2].', '.$dc[4].' at '.$dc[3]; |
} |
} |
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sub answer_date { |
sub answer_date { |
my @dc = split(/\s+/,localtime(&EXT('resource.0.answerdate'))); |
my @dc = split(/\s+/,localtime(&EXT('resource.0.answerdate'))); |
return $dc[0].', '.$dc[1].' '.$dc[2].', '.$dc[4].' at '.$dc[3]; |
return '' if ($dc[0] eq "Wed" and $dc[2] == 31 and $dc[4] == 1969); |
} |
my @hm = split(/:/,$dc[3]); |
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my $ampm = " am"; |
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if ($hm[0] > 12) { |
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$hm[0]-=12; |
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$ampm = " pm"; |
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} |
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return $dc[0].', '.$dc[1].' '.$dc[2].', '.$dc[4].' at '.$hm[0].':'.$hm[1].$ampm; |
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# return $dc[0].', '.$dc[1].' '.$dc[2].', '.$dc[4].' at '.$dc[3]; |
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} |
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sub array_moments { |
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my @input=@_; |
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my (@output,$N); |
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$N=scalar (@input); |
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$output[0]=$N; |
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if ($N <= 1) { |
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$output[1]=$input[0]; |
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$output[1] = "Input array not defined" if ($N == 0); |
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$output[2]="variance undefined for N<=1"; |
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$output[3]="skewness undefined for N<=1"; |
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$output[4]="kurtosis undefined for N<=1"; |
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return @output; |
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} |
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my $sum=0; |
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foreach my $line (@input) { |
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$sum+=$line; |
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} |
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$output[1] = $sum/$N; |
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my ($x,$sdev,$var,$skew,$kurt) = 0; |
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foreach my $line (@input) { |
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$x=$line-$output[1]; |
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$var+=$x**2; |
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$skew+=$x**3; |
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$kurt+=$x**4; |
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} |
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$output[2]=$var/($N-1); |
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$sdev=sqrt($output[2]); |
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if ($sdev == 0) { |
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$output[3]="inf-variance=0"; |
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$output[4]="inf-variance=0"; |
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return @output; |
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} |
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$output[3]=$skew/($sdev**3*$N); |
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$output[4]=$kurt/($sdev**4*$N)-3; |
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return @output; |
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} |
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sub choose { |
sub choose { |
my $num = $_[0]; |
my $num = $_[0]; |
return $_[$num]; |
return $_[$num]; |
} |
} |
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#$external::randomseed=time; |
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#$a=2; |
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#$b=2; |
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#$c=2; |
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#&map(1,\$a,\$b,\$c,3,4,5); |
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#print $a."\n".$b."\n"; |
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