Alexander Shumakovitch on Thu, 29 May 2003 22:50:19 +0200

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Re: matsnf segfaults

On Thu, May 29, 2003 at 08:53:31PM +0200, Karim BELABAS wrote:
> Fixed in CVS (bundled with extensive cleanup), and backported (minimal
> patch) to the stable branch.
Thanks a lot!

> P.S: Note that the algorithm used is spectacularly inefficient in medium to
> large dimensions (it was written to be used for 10 x 10 matrices...), so I
> doubt the computation will ever finish.
That's weird! In fact, this matrix was produced by mathnf to speed up
the calculations. It was always the case for me that matsnf performs
faster on matrices prepared by mathnf first. Now in this case, it takes
less than a second to get the SNF of the original matrix directly. But
way too much after HNF (it complained about low memory after a couple of
minutes). Is it expected?

Thanks again,

  --- Alexander.