[Numpy-discussion] Problems with Numexpr and discontiguous arrays
Ivan Vilata i Balaguer
ivilata at carabos.com
Thu Oct 5 11:59:45 EDT 2006
En/na Tim Hochberg ha escrit::
> Tim Hochberg wrote:
>>>> Ivan Vilata i Balaguer wrote:
>>>>> It seemed that discontiguous arrays worked OK in Numexpr since
>>>>> r1977 or
>>>>> so, but I have come across some alignment or striding problems
>>>>> which can
>>>>> be seen with the following code::
> OK, I've checked in a fix for this that makes a copy when the array is
> not strided in an even multiple of the itemsize. I first tried copying
> for all discontiguous array, but this resulted in a large speed hit for
> vanilla strided arrays (a=arange(10)[::2], etc.), so I was more frugal
> with my copying. I'm not entirely certain that I caught all of the
> problematic cases, so let me know if you run into any more issues like this.
Great! For the moment I just can say that the problems I had with that
have disappeared, but I will keep you up to date if I find something
else. Thank you very much!
::
Ivan Vilata i Balaguer >qo< http://www.carabos.com/
Cárabos Coop. V. V V Enjoy Data
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