Masked array set slice fails with np.ma.masked on right side #8624
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component: numpy.ma
masked arrays
Comments
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Interestingly, this works as expected: |
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A related bug came up in #8510, which I'll repeat here since that wasn't the focus of that issue: >>> arr = np.ma.arange(5)
>>> arr[1:3] = [1, np.ma.masked]
ValueError: setting an array element with a sequence.
#expected result:
>>> arr
masked_array(data = [0 1 -- 3 4],
mask = [False False True False False],
fill_value = 999999) |
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Your code fails in the same way as the above for me on both master and 1.11.1 |
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This no longer reproduces and this problem is "fixed" >>> x = np.ma.MaskedArray([1,2,3])
>>> x[:2] = [100, np.ma.masked]
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/lib/python3.6/dist-packages/numpy/ma/core.py", line 3323, in __setitem__
_data[indx] = dval
File "/usr/local/lib/python3.6/dist-packages/numpy/ma/core.py", line 4312, in __int__
raise MaskError('Cannot convert masked element to a Python int.')
numpy.ma.core.MaskError: Cannot convert masked element to a Python int.>>> x = np.ma.MaskedArray([1,2,3])
>>> x[:2] = np.ma.asarray([100, np.ma.masked], dtype=int)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/lib/python3.6/dist-packages/numpy/ma/core.py", line 7771, in asarray
subok=False, order=order)
File "/usr/local/lib/python3.6/dist-packages/numpy/ma/core.py", line 2788, in __new__
order=order, subok=True, ndmin=ndmin)
File "/usr/local/lib/python3.6/dist-packages/numpy/ma/core.py", line 4312, in __int__
raise MaskError('Cannot convert masked element to a Python int.')
numpy.ma.core.MaskError: Cannot convert masked element to a Python int.>>> arr = np.ma.arange(5)
>>> arr[1:3] = [1, np.ma.masked]
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/lib/python3.6/dist-packages/numpy/ma/core.py", line 3323, in __setitem__
_data[indx] = dval
File "/usr/local/lib/python3.6/dist-packages/numpy/ma/core.py", line 4312, in __int__
raise MaskError('Cannot convert masked element to a Python int.')
numpy.ma.core.MaskError: Cannot convert masked element to a Python int. |
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The following behavior is not what I would expect and seems like a bug:
One can correctly set a single item (e.g.
x[2] = np.ma.masked) or set a slice to a scalar (x[:2] = np.ma.masked).I'm using numpy 1.11.3.
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