8000 np.concatenate([ [], [1] ]) converts integer to float · Issue #8878 · numpy/numpy · GitHub
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Muxas opened this issue Mar 31, 2017 · 1 comment
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np.concatenate([ [], [1] ]) converts integer to float #8878

Muxas opened this issue Mar 31, 2017 · 1 comment

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@Muxas
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Muxas commented Mar 31, 2017

When concatenating empty list with a list of INTEGERS result is an array of FLOATS. Since numpy 1.12 you can not use floats (result of such concatenation) for indexing without additional convertion from float to integer.

Following example works in numpy <=1.11 and does not work in numpy >= 1.12:

array = np.arange(3)
ind0 = []
ind1 = [1]
total_ind = np.concatenate([ind0, ind1])
print array[total_ind]
@jaimefrio
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jaimefrio commented Mar 31, 2017 •
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Closing because this is a duplicate of #1586. There's #7450 that would fix it, but we never got around to merge it...

@eric-wieser eric-wieser mentioned this issue Nov 29, 2017
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