On Tue, Dec 30, 2014 at 2:49 PM, Benjamin Root <ben.r...@ou.edu> wrote:
> Where does it say that operations on masked arrays should not produce NaNs? Masked arrays were invented with the specific goal to avoid carrying NaNs in computations. Back in the days, NaNs were not available on some platforms and had significant performance issues on others. These days NaN support for floating point types is nearly universal, but numpy types are not limited by floating point. > Having np.mean([]) return the same thing as np.ma.mean([]) makes complete sense. Does the following make sense as well? >>> import numpy >>> numpy.ma.masked_values([0, 0], 0).mean() masked >>> numpy.ma.masked_values([0], 0).mean() masked >>> numpy.ma.masked_values([], 0).mean() * Two warnings * masked_array(data = nan, mask = False, fill_value = 0.0)
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