Repository navigation
ma.where does not work with structured types. #5826
Description
I think this is an easy fix for someone familiar with the ma module.
In [1]: x = np.ones(3, dtype=[('a', 'i4'), ('b', 'f4')]).view(ma.MaskedArray)
In [2]: y = np.zeros(3, dtype=[('a', 'i4'), ('b', 'f4')]).view(ma.MaskedArray)
In [3]: ma.where([True, False, True], x, y)
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-3-5e3a8c327920> in <module>()
----> 1 ma.where([True, False, True], x, y)
/home/charris/.local/lib/python2.7/site-packages/numpy/ma/core.pyc in where(condition, x, y)
6786 # Create an empty mask and fill it
6787 mask = np.zeros(fc.shape, dtype=MaskType)
-> 6788 np.copyto(mask, getmask(x), where=fc)
6789 np.copyto(mask, getmask(y), where=notfc)
6790 mask |= getmaskarray(condition)
TypeError: Cannot cast scalar from dtype([('a', '?'), ('b', '?')]) to dtype('bool') according to the rule 'same_kind'
Activity
githubmlai commentedon Jul 11, 2015
Not easy fix?
It might have to use result_type in where function
might help but cause further error because you can't do OR operation on structured mask
e.g.
throws error
eric-wieser commentedon Sep 27, 2017
This is fixed in 1.14-dev:
Edit: #8647