On Fri, Dec 14, 2012 at 06:51:06PM -0800, Travis Scrimshaw wrote:
> I ran %prun on the partitions of 150 and there is a large amount of time
> spent in the infinity element constructor, calling isinstance, and the
> rightmost_pivot.
Thanks for investigating this! If you feel like it, I am all in favor
of a small patch taking care of the most urgent optimizations before
we go for the full cythonization. I am not surprised by the results of
your timings. In MuPAD we had done a similar optimization by using the
infinite value of IEEE floats (and its negative); it was quite fast,
and we did not even have to handle a special case. Could you give it a
shot using the following?
sage: float('inf')
inf
I got the pleasant surprise that Sage's infinity plays well with
float('inf'):
sage: float(infinity)
inf
sage: float('inf') == infinity
False
sage: float('inf') < infinity
True
sage: float('inf') > infinity
False
sage: float('-inf') < infinity
True
sage: float('-inf') > -infinity
True
Cheers,
Nicolas
--
Nicolas M. Thiéry "Isil" <nthi...@users.sf.net>
http://Nicolas.Thiery.name/
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