[Numpy-discussion] Two questions about PEP 465 dot product

Charles R Harris charlesr.harris at gmail.com
Fri May 22 02:02:49 EDT 2015

On Thu, May 21, 2015 at 7:06 PM, Alexander Belopolsky <ndarray at mac.com>

> 1. Is there a simple expression using existing numpy functions that
> implements PEP 465 semantics for @?
> 2. Suppose I have a function that takes two vectors x and y, and a matrix
> M and returns x.dot(M.dot(y)).  I would like to "vectorize" this function
> so that it works with x and y of any ndim >= 1 and M of any ndim >= 2
> treating multi-dimensional x and y as arrays of vectors and M as an array
> of matrices (broadcasting as necessary).  The result should be an array of
> xMy products.  How would I achieve that using  PEP 465's @?
If you are willing to run Python 3.5 (use 3.6.0a3, a4 crawls with the
bugs), you can use gh-5878 <https://github.com/numpy/numpy/pull/5878>. The
override mechanisms are still in process in Nathaniel's PR, so that may
change. I'd welcome any feedback.

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