On 6/21/06, Travis Oliphant <[EMAIL PROTECTED]> wrote: > Johannes Loehnert wrote: > > Hi, > > > > > >> I'm not sure why bool arrays cannot be used as indices. > >> The "natural" solution to the original problem seemed to be: > >> M[:,V>0] > >> but this is not allowed. > >> > > > > I started a thread on this earlier this year. Try searching the archive for > > "boolean indexing" (if it comes back online somewhen). > > > > Travis had some reason for not implementing this, but unfortunately I do not > > remember what it was. The corresponding message might still linger on my > > home > > > > PC, which I can access this evening.... > > > > I suspect my reason was just not being sure if it could be explained > consistently. But, after seeing this come up again. I decided it was > easy enough to implement. > > So, in SVN NumPy, you will be able to do > > a[:,V>0] > a[V>0,:] > > The V>0 will be replaced with integer arrays as if nonzero(V>0) had been > called. >
does it work for a[<boolean>,<boolean>] ? what about a[ix_( nonzero(<boolean>), nonzero(<boolean>) )] ? maybe the <boolean> to nonzero(<boolean>) conversion would be more coherently done by the ix_ function than by the [] pau _______________________________________________ Numpy-discussion mailing list Numpy-discussion@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/numpy-discussion
