NAME

Business::BR::Ids::Common - Common code used in Business-BR-Ids modules

SYNOPSIS

use Business::BR::Ids::Common qw(_dot);
my @digits = (1, 2, 3, 3);
my @weights = (2, 3, 2, 2);
my $dot = _dot(\@weights, \@digits); # computes 2*1+3*2+3*2+2*3

DESCRIPTION

This module is meant to be private for Business-BR-Ids distributions. It is a common placeholder for code which is shared among other modules of the distribution.

Actually, the only code here is the computation of the scalar product between two array refs. In the future, this module can disappear being more aptly named and even leave the Business::BR namespace.

_dot

$s = dot(\@a, \@b);

Computes the scalar (or dot) product of two array refs:

sum( a[i]*b[i], i = 0..$#a )

Note that due to this definition, the second argument should be at least as long as the first argument.

EXPORT

None by default.

You can explicitly ask for _dot() which is a sub to compute the dot product between two array refs (used for computing check digits).

SEE ALSO

Please reports bugs via CPAN RT, http://rt.cpan.org/NoAuth/Bugs.html?Dist=Business-BR-Ids

AUTHOR

A. R. Ferreira, <ferreira@cpan.org>

COPYRIGHT AND LICENSE

Copyright (C) 2005 by A. R. Ferreira

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.6 or, at your option, any later version of Perl 5 you may have available.