well, I would benchmark it against LAPACK, but I don't have the time, but if you want, you can do the benchmark and show me that I'm wrong :)
As a matter of fact, I would like to see some benchmarks myself, who knows, maybe I'm completely wrong(I saw most of the PDL code is C code and the Perl is just calling that).
the main problem is if people would use Perl+PDL for scientific/financial computing, but if they decide they won't use it, it doesn't matter if it's fast or slow. I think it is slower than LAPACK which doesn't necessarily make it very slow, just slower than LAPACK ..
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