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empty_like does not copy mask (Trac #1979) #2572

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numpy-gitbot opened this issue Oct 19, 2012 · 2 comments
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empty_like does not copy mask (Trac #1979) #2572

numpy-gitbot opened this issue Oct 19, 2012 · 2 comments
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@numpy-gitbot
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Original ticket http://projects.scipy.org/numpy/ticket/1979 on 2011-11-14 by trac user mauro, assigned to unknown.

If empty_like (and also zeros_like, ones_like) is called with a masked array, then the returned array's mask is identical to the originals (i.e. shares same reference).

I think what should happen is that a new mask is returned set to False.
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Attachment added by trac user mauro on 2011-11-14: empty_like_ma_bug.py

@AgilentGCMS AgilentGCMS mentioned this issue Mar 14, 2013
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tomyun added a commit to tomyun/numpy that referenced this issue Jun 5, 2013
@tomyun
Force empty/ones/zeros_like() to copy mask
a5a3457 
As underlying `empty_like()` knows nothing about mask, it would be
`_convert2ma`'s job to properly set up the output mask. `copy` argument
is added to figure out which functions need this behavior.

`ones_like()` and `zeros_like()` which were mere aliases of regular
numpy functions now go through `_convert2ma` as well.

Hopefully this fixes numpy#3145, numpy#2572.
@tomyun tomyun mentioned this issue Jun 6, 2013
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@jjhelmus
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PR #5203 addresses this issue and I believe this can be closed.

The current behavior of empty_like, zeros_like, etc is that the retuned array's mask is identical to the original but does not share a reference.

@njsmith njsmith closed this as completed Oct 19, 2015
@gerritholl gerritholl mentioned this issue Dec 3, 2015
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@njsmith @jjhelmus @numpy-gitbot