[Numpy-discussion] MaskedArray, view, and fill_value
Thomas Robitaille
thomas.robitaille at gmail.com
Fri Oct 26 14:54:46 EDT 2012
Hi everyone,
Could someone explain the following behavior?
>>> from numpy import ma
>>> x = ma.array([1,2,3])
>>> x.fill_value = 1
>>> x.view(ma.MaskedArray)
masked_array(data = [1 2 3],
mask = False,
fill_value = 999999)
i.e. the fill_value gets reset. It looks from ma/core.py like it is deliberate:
# Make sure to reset the _fill_value if needed
if getattr(output, '_fill_value', None) is not None:
output._fill_value = None
but this doesn't make any sense to me... Any ideas? I'm thinking maybe
it should be:
# Make sure to reset the _fill_value if needed
if getattr(output, '_fill_value', None) is not None and dtype is not None:
output._fill_value = None
because then it would make sense to reset the fill_value if the dtype
has changed. Any thoughts?
Thanks,
Tom
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