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Joe Just another Perl shrine  Re^5: Performance problem with
Clone Method  by dcmertens (Beadle) on Jul 27, 2011 at 20:41 UTC
( #917129=note: print w/ replies, xml ) Need Help??  in reply to
Re^4: Performance problem with Clone Method in thread
Performance problem with Clone Method  Unfortunately I don't
know anything about the OP's problem and an internet search has
not proved forthcoming with a simple explanation, in matrix
terms, of the Ullmann algorithm. If Commandosupremo could spell
out his implementation of the algorithm, giving a list of the
operations needed, I could say PDL is the right tool or not. As
to your specific points, PDL may be able to handle the
operations you pose, depending on what you mean.  PDL supports a
whole slew of operations including bitwise boolean operations,
as mentioned here: For counting the set bits, that's just a sum;
you can perform that and many other row or whole-piddle
operations as discussed here: The imp