1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
|
package PDF::API2::Matrix;
use strict;
use Carp;
our $VERSION = '2.048'; # VERSION
sub new {
my $type = shift();
my $self = [];
my $col_count = scalar(@{$_[0]});
foreach my $row (@_) {
unless (scalar(@$row) == $col_count) {
carp 'Inconsistent column count in matrix';
return;
}
push @$self, [@$row];
}
return bless($self, $type);
}
sub transpose {
my $self = shift();
my @result;
my $m;
for my $col (@{$self->[0]}) {
push @result, [];
}
for my $row (@$self) {
$m = 0;
for my $col (@$row) {
push @{$result[$m++]}, $col;
}
}
return PDF::API2::Matrix->new(@result);
}
sub vector_product {
my ($a, $b) = @_;
my $result = 0;
for my $i (0 .. $#{$a}) {
$result += $a->[$i] * $b->[$i];
}
return $result;
}
sub multiply {
my $self = shift();
my $other = shift->transpose();
my @result;
unless ($#{$self->[0]} == $#{$other->[0]}) {
carp 'Mismatched dimensions in matrix multiplication';
return;
}
for my $row (@$self) {
my $result_col = [];
for my $col (@$other) {
push @$result_col, vector_product($row, $col);
}
push @result, $result_col;
}
return PDF::API2::Matrix->new(@result);
}
1;
|
