Oops, sorry, one more: subtraction is not required of course, and, more importantly, next gen calculation expression can be split in 2 lines -- same 4 ops but presumably done in-place i.e. faster:

    $m &= $n == 4;
    $m |= $n == 3;

__END__

Game of Life!
Matrix: PDL: Long D [2000,2000], 10 generations
Faster+:   0.677 s

[download]

In reply to Re^4: Fast sliding submatrix sums with PDL (inspired by PWC 248 task 2) by Anonymous Monk
in thread Fast sliding submatrix sums with PDL (inspired by PWC 248 task 2) by Anonymous Monk

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