/ 
String-Combination-0.01
/ String::Combination

NAME

String::Combination - An algorithm to calculate all the strings resulting from a combination of k characters from n characters available.

SYNOPSIS

use String::Combination qw(combination);

my @array=combination("foo",2);

print "$_ " foreach (@array);

#prints of fo of fo oo oo 


my @array=combination("bar",3);

print "$_ " foreach (@array);

#prints abr arb rab rba bra bar

DESCRIPTION

From a set of n elements, given an integer k, the algorithm calculates k! * n!/(k!(n-k)!) elements that are all the combinations of k elements from the set of n elements.

The combination function needs a string (every character is an element of the set of n=length(string) elements) and an integer value that is k.

The function returns a list of values.

If the function returns an empty list, an error has occured and you can retrive its description from $String::Combination::err .

AUTHORS

The C algorithm and code is by Andrea Gasparri, the XS glue is by Dree Mistrut with a help from dada <dada@perl.it>.

Copyright 2004 Andrea Gasparri <andrea@slack.z00.it> and Dree Mistrut <dree@friul.it>.

This package is free software and is provided "as is" without express or implied warranty. You can redistribute it and/or modify it under the same terms as Perl itself.