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How do I create a matrix?

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Contributed by eyal_kle on Jun 07, 2001 at 11:49 UTC
Q&A  > arrays


Description:

How do I create a matrix? is it @@matrix?

Answer: How do I create a matrix?
contributed by jeffa

Heh, close. :)
The trick is to use an array of array references:

my @matrix = ( [qw(0 0 0 0)], [qw(0 0 1 0)], [qw(0 1 0 0)], [qw(1 0 0 0)], ); foreach my $row (@matrix) { print join(":",@$row), "\n"; } # qw(1 0 0 0) is better way of saying (1,0,0,0)
Answer: How do I create a matrix?
contributed by Beatnik

You can use PDL::Matrix

#!/usr/bin/perl -w use strict; use PDL::Matrix; my $m = pdl [ [1,2,3], [4,5,6], [7,8,9] ];
Which then also allows you to perform clean, fast math on them.
my $m = pdl [ [1,2,3], [4,5,6], [7,8,9] ]; my $n = pdl [ [1,0,0], [0,1,0], [0,0,1] ]; my $r = $m x $n;

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