8000 nonzero() requires swap for float types (Trac #1662) · Issue #2258 · numpy/numpy · GitHub
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nonzero() requires swap for float types (Trac #1662) #2258

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numpy-gitbot opened this issue Oct 19, 2012 · 3 comments
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nonzero() requires swap for float types (Trac #1662) #2258

numpy-gitbot opened this issue Oct 19, 2012 · 3 comments
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00 - Bug component: Other
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1.6.0

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Original ticket http://projects.scipy.org/numpy/ticket/1662 on 2010-11-05 by @mwiebe, assigned to unknown.

The current floating-point nonzero() implementation is incorrect for non-native byte order. Swapping the order should have no effect, but it can change the result as visible here:

>>> import numpy as np
>>> a = np.array([0x80000000, 0x00000080, 0], dtype=np.uint32)
>>> a.dtype = np.float32
>>> print a.nonzero()
(array([1]),)
>>> print a.byteswap().newbyteorder().nonzero()
(array([0]),)
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@mwiebe wrote on 2010-11-05

#10

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@charris wrote on 2010-11-07

Fixed in commit 6e5590f. Thanks.

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Milestone changed to 1.6.0 by @mwiebe on 2011-05-24

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