[Numpy-discussion] Need help for implementing a fast clip in numpy (was slow clip)
oliphant at ee.byu.edu
Fri Jan 12 18:19:59 CST 2007
Christopher Barker wrote:
>>Now, it is exposed in the concept of an array iterator. Anybody
>>can take advantage of it as it there is a C-API call to get an array
>>iterator from the array
>Is this iterator as efficient as incrementing the index for contiguous
>arrays? i.e. is there any point of special casing contiguous arrays if
>you use it?
Contiguous arrays are special-cased already (as are 1-d arrays), so not
really. There is a little-bit of overhead in testing for the
special-case that you can overcome by testing for the special-case
outside the looping structure on your own.
I'm not sure how much speed gain is accomplished doing that.
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