On Wed, Apr 6, 2016 at 3:21 PM Nathaniel Smith <n...@pobox.com> wrote:
> Can you elaborate on what you're doing that you find verbose and > confusing, maybe paste an example? I've never had any trouble like > this doing linear algebra with @ or dot (which have similar semantics > for 1d arrays), which is probably just because I've had different use > cases, but it's much easier to talk about these things with a concrete > example in front of us to put everyone on the same page. > > -n > Here's another example that I've seen catch people now and again. A = np.random.rand(100, 100) b = np.random.rand(10) A * b.T In this case the user pretty clearly meant to be broadcasting along the rows of A rather than along the columns, but the code fails silently. When an issue like this gets mixed into a larger series of broadcasting operations, the error becomes difficult to find. This error isn't necessarily unique to beginners either. It's a common typo that catches intermediate users who know about broadcasting semantics but weren't keeping close enough track of the dimensionality of the different intermediate expressions in their code. Best, -Ian Henriksen
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