### How do I create a matrix?

by eyal_kle (Initiate)
 on Jun 07, 2001 at 11:49 UTC Need Help??
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) [download] 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] ]; [download] 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; [download]

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