On Thu, Oct 21, 2010 at 12:18 PM, Pauli Virtanen <p...@iki.fi> wrote:
> Thu, 21 Oct 2010 11:03:52 -0600, Charles R Harris wrote: > [clip] > > I think the important thing to settle here is just how dtype comparisons > > are supposed to work. The current implementation might well be intended > > and if so we need to know why it is so. I'd like Travis to weigh in > > here. > > To me it seems that sub-arrays were not considered in the initial > implementation for `==`. > > I do not see reasons why one would want to have > > a = dtype([('a', 'i1', (3, 3))]) > b = dtype([('a', 'i1', 9)]) > a == b > > In any case the current implementation is inconsistent, since currently > > hash(a) != hash(b) > > However, I can see why one would want to have CanCastSafely to be true > between these types. > > Checking the shape seems like the right thing to do, I just want to be sure that we aren't overlooking something. If we make the change will we need to fix CanCastSafely? > *** > > The other issue of allowing broadcasting in sub-arrays --- it does not > seem very useful to me. Unlike arrays, the dimensions of sub-arrays > cannot be manipulated easily, and so many use-cases of broadcasting just > disappear. > > Chuck
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