On Thu, Jun 4, 2015 at 9:04 PM, Nathaniel Smith <njs@pobox.com> wrote:

On Thu, Jun 4, 2015 at 5:57 PM, Nathaniel Smith <njs@pobox.com> wrote:

One place where the current behavior is particularly baffling and annoying is when you have multiple boolean masks in the same indexing operation. I think everyone would expect this to index separately on each axis ("outer product indexing" style, like slices do), and that's really the only useful interpretation, but that's not what it does...:

As a huge user of boolean indexes, I have never expected this to work in any way, shape or form. I don't think it works in matlab (but someone should probably check that), so you wouldn't have to worry about converts missing a feature from there. I have always been told that boolean indexing will produce a flattened array, and I wouldn't want to be dealing with magic when the array does not match up right.

Now, what if the boolean array is broadcastable (dimension-wise, not length-wise)? I do see some uses there. Modulo that, my vote is to deprecate.

Ben Root