That code was my answer to a question on how to do numerical integration using perl:
#!/usr/bin/perl
use strict;
use warnings;
package Range;
sub new {
my $class = shift;
my $lower = shift;
my $upper = shift;
my $delta = shift || 0.0001;
my $self = {
lower => $lower,
upper => $upper,
delta => $delta,
current => $lower,
};
return bless $self, $class;
}
sub next {
my $self = shift;
if ($self->{current} + $self->{delta} < $self->{upper}) {
$self->{current} += $self->{delta};
return 1;
} else {
return undef;
}
}
package main;
sub integrate {
my $function = shift;
my $iter = shift;
my $sum;
do {
$sum += $function->($iter->{current}) * $iter->{delta};
} while ($iter->next());
return $sum;
}
print sprintf("%.2f", integrate(sub {(shift)**2}, new Range (2, 5))),
+"\n";
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