It's trivial enough to just code this. See perlref, for, open, split, join, print, close. The operator for reading from a file is to enclose the filehandle in '<' '>'. A matrix in Perl is just an array of array references, e.g.

# matrix of random numbers
my @matrix;
for my $y ( 0..9 ) {
    my @row = ();
    for my $x ( 0..9 ) {
        push @row, 100*rand();
    }
    push @matrix, \@row;
}
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