It's one part of my attempt to write a reasonably efficient function to calculate f(a, b), the number of full-spectrum rook's walks on an a x b board. (The integer sequence A096121 handles the specific case of a = 2, but I wish to extend to the more general case.)

I'd be kinda surprised if there were already a CPAN module for this, though I suspect an understanding of PDL might help.

Hugo

In reply to Re^2: better algorithm: bitwise reordering by hv
in thread better algorithm: bitwise reordering by hv

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