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Added NotImplemented error to Array.concatenate #508
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This isn't correct. This should instead be based on contiguity. Column-major arrays for example allow concatenation along the last axis.
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I noticed that the code failed the tests because I missed a syntax error. Sorry for the noise.
About contiguity, I did some tests, and the function does not work in any axis for colum-major arrays. In line 2571 of the Array.concatenate function, the output array
result
is always a row-major array, leading to the sameNotImlementedError
due to miss-matching strides.Simple example:
It shouldn't be hard to allow column-major arrays, it is just a matter of initializing the result array with
order="F"
in these cases. The issue I see is that the Array class has no member that indicates the ordering. One could deduce the order by looking at the strides (if Array.strides[0] > Array.strides[-1]: row-major, else: column-major) but maybe it is too hacky. what do you think?Another approach is the one taken in the Array.stack function, in which when the axis != 0, it is assumed that the input is column mayor. But it would also lead to unclear error messages.
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Thanks for pointing out the issue with
concatenate
and column-major arrays, we should look into fixing that. I agree with your assessment about inspection of the strides, it's not quite elegant.FWIW, CI is still not passing on this branch.
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Oh yeah! I forgot to push. It should work now.