Hm. Intriguing. It seems that the Windows versions are doing the 'right thing'. Ie. ignoring the argument when you call rand and returning a random float 'tween 0 .. 1.

To get the equivalent behaviour of the built-in rand where the random float is multiplied by the argument, you need to import the function irand().

I cannot see by inspection why (or even how) you get different behaviour on linux?

It seems it should do the same thing as the Windows install:

sub rand
{
    my ($self, $N) = @_;

    unless (ref $self) {
        Math::Random::MT::srand() unless defined $gen;
        $self = $gen;
    }

    return $self->genrand();
}

sub irand
{
    my ($self, $N) = @_;

    unless (ref $self) {
        $N = $self;
        Math::Random::MT::srand() unless defined $gen;
        $self = $gen;
    }

    return ($N || 1) * $self->genirand();
}
[download]