[Numpy-discussion] Vector stacks

Eric Wieser wieser.eric+numpy at gmail.com
Sat Jul 1 18:38:56 EDT 2017


What would these classes offer over these simple functions:

def rvec(x):  return x[...,np.newaxis,:]def cvec(x):  return x[...,:,np.newaxis]

That also makes rvec(x) + cvec(y) behave in the least surprising way, with
no extra work

Eric
​

On Sat, 1 Jul 2017 at 23:32 Charles R Harris <charlesr.harris at gmail.com>
wrote:

> Hi All,
>
> The  '@' operator works well with stacks of matrices, but not with stacks
> of vectors. Given the recent addition of '__array_ufunc__',  and the intent
> to make `__matmul__` use a ufunc, I've been wondering is it would make
> sense to add ndarray subclasses 'rvec' and 'cvec' that would override that
> operator so as to behave like stacks of row/column vectors. Any other ideas
> for the solution to stacked vectors are welcome.
>
> Thoughts?
>
> Chuck
>
>
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