On Mon, May 19, 2008 at 9:34 AM, Orest Kozyar <[EMAIL PROTECTED]> wrote: > Given a slice, such as s_[..., :-2:], is it possible to take the > complement of this slice? Specifically, s_[..., ::-2].
Hmm, that doesn't look like the complement. Did you mean s_[..., -2:] and s_[..., :-2]? > I have a > series of 2D arrays that I need to split into two subarrays via > slicing where the members of the second array are all the members > leftover from the slice. The problem is that the slice itself will > vary, and could be anything such as s_[..., 1:4:] or s_[..., 1:-4:], > etc, so I'm wondering if there's a straightforward idiom or routine in > Numpy that would facilitate taking the complement of a slice? I've > looked around the docs, and have not had much luck. In general, for any given slice, there may not be a slice giving the complement. For example, the complement of arange(6)[1:4] should be array([0,4,5]), but there is no slice which can make that. Things get even more difficult with start:stop:step slices let alone simultaneous multidimensional slices. Can you be more specific as to exactly the variety of slices you need to support? -- Robert Kern "I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth." -- Umberto Eco _______________________________________________ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion
