#!perl
use strict;
use warnings;
use Math::Matrix;
use Test::More tests => 12;
{
    my $x = Math::Matrix -> new([[1, 0, 0],[0, 1, 0],[0, 0, 1]]);
    my $y = $x -> to_permvec();
    is(ref($y), 'Math::Matrix', '$y is a Math::Matrix');
    is_deeply([ @$y ], [[0], [1], [2]],
              '$y has the right values');
    # Verify that modifying $y does not modify $x.
    my ($nrowy, $ncoly) = $y -> size();
    for my $i (0 .. $nrowy - 1) {
        for my $j (0 .. $ncoly - 1) {
            $y -> [$i][$j] += 100;
        }
    }
    is_deeply([ @$x ], [[1, 0, 0],[0, 1, 0],[0, 0, 1]], '$x is unmodified');
}
{
    my $x = Math::Matrix -> new([[1, 0, 0],[0, 0, 1],[0, 1, 0]]);
    my $y = $x -> to_permvec();
    is(ref($y), 'Math::Matrix', '$y is a Math::Matrix');
    is_deeply([ @$y ], [[0], [2], [1]],
              '$y has the right values');
    # Verify that modifying $y does not modify $x.
    my ($nrowy, $ncoly) = $y -> size();
    for my $i (0 .. $nrowy - 1) {
        for my $j (0 .. $ncoly - 1) {
            $y -> [$i][$j] += 100;
        }
    }
    is_deeply([ @$x ], [[1, 0, 0],[0, 0, 1],[0, 1, 0]], '$x is unmodified');
}
{
    my $x = Math::Matrix -> new([[0, 0, 1],[0, 1, 0],[1, 0, 0]]);
    my $y = $x -> to_permvec();
    is(ref($y), 'Math::Matrix', '$y is a Math::Matrix');
    is_deeply([ @$y ], [[2], [1], [0]],
              '$y has the right values');
    # Verify that modifying $y does not modify $x.
    my ($nrowy, $ncoly) = $y -> size();
    for my $i (0 .. $nrowy - 1) {
        for my $j (0 .. $ncoly - 1) {
            $y -> [$i][$j] += 100;
        }
    }
    is_deeply([ @$x ], [[0, 0, 1],[0, 1, 0],[1, 0, 0]], '$x is unmodified');
}
{
    my $x = Math::Matrix -> new([]);
    my $y = $x -> to_permvec();
    is(ref($y), 'Math::Matrix', '$y is a Math::Matrix');
    is_deeply([ @$y ], [],
              '$y has the right values');
    is_deeply([ @$x ], [], '$x is unmodified');
}