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PJACKLAM / Math-Matrix-0.94 / t / getcol.t 

            

              
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#!perl
use strict;
use warnings;
use Math::Matrix;
use Test::More tests => 11;
note('$x -> getcol(1);');
{
    my $x = Math::Matrix -> new([[  1,  2,  3,  4 ],
                                 [  5,  6,  7,  8 ],
                                 [  9, 10, 11, 12 ],
                                 [ 13, 14, 15, 16 ]]);
    my $y = $x -> getcol(1);
    is(ref($y), 'Math::Matrix', '$y is a Math::Matrix');
    is_deeply([ @$y ], [[ 2 ], [ 6 ], [ 10 ], [ 14 ]],
              '$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,  2,  3,  4 ],
                        [  5,  6,  7,  8 ],
                        [  9, 10, 11, 12 ],
                        [ 13, 14, 15, 16 ]], '$x is unmodified');
}
note('$x -> getcol([3, 1]);');
{
    my $x = Math::Matrix -> new([[  1,  2,  3,  4 ],
                                 [  5,  6,  7,  8 ],
                                 [  9, 10, 11, 12 ],
                                 [ 13, 14, 15, 16 ]]);
    my $y = $x -> getcol([3, 1]);
    is(ref($y), 'Math::Matrix', '$y is a Math::Matrix');
    is_deeply([ @$y ], [[  4,  2 ],
                        [  8,  6 ],
                        [ 12, 10 ],
                        [ 16, 14 ]],
              '$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,  2,  3,  4 ],
                        [  5,  6,  7,  8 ],
                        [  9, 10, 11, 12 ],
                        [ 13, 14, 15, 16 ]], '$x is unmodified');
}
note('$x -> getcol([]);');
{
    my $x = Math::Matrix -> new([[  1,  2,  3,  4 ],
                                 [  5,  6,  7,  8 ],
                                 [  9, 10, 11, 12 ],
                                 [ 13, 14, 15, 16 ]]);
    my $y = $x -> getcol([]);
    is(ref($y), 'Math::Matrix', '$y is a Math::Matrix');
    is_deeply([ @$y ], [],
              '$y has the right values');
}
note('$x -> getcol([3.14, 1.25]);');
{
    my $x = Math::Matrix -> new([[  1,  2,  3,  4 ],
                                 [  5,  6,  7,  8 ],
                                 [  9, 10, 11, 12 ],
                                 [ 13, 14, 15, 16 ]]);
    my $y = $x -> getcol([3.14, 1.25]);
    is(ref($y), 'Math::Matrix', '$y is a Math::Matrix');
    is_deeply([ @$y ], [[  4,  2 ],
                        [  8,  6 ],
                        [ 12, 10 ],
                        [ 16, 14 ]],
              '$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,  2,  3,  4 ],
                        [  5,  6,  7,  8 ],
                        [  9, 10, 11, 12 ],
                        [ 13, 14, 15, 16 ]], '$x is unmodified');
}