[Numpy-discussion] MA bug or feature? (original) (raw)
Michael Sorich michael.sorich at gmail.com
Wed Jun 21 04:46:19 EDT 2006
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When transposing a masked array of dtype '<f8' I noticed that an ndarray of dtype '|O4' was returned. I found this a little strange as the masked array did not contain any masked values. Upon closer examination (see script below) it seems that if the mask is a boolean array with all false values and the fill_value is a string this will occur. However if the fill_value is a number or the mask is simply False, the dtype stays as '<f8'. I was going to submit this as a bug but wanted to check that this was not a deliberate feature.
I am using the numpy version that comes with a recent version of python enthought edition.
import numpy print numpy.version.version
ma1 = numpy.ma.array(((1.,2,3),(4,5,6)), mask=((0,0,0),(0,0,0))) print ma1.filled('NA').dtype print ma1.filled(-999).dtype
ma2 = numpy.ma.array(((1.,2,3),(4,5,6)), mask=False) print ma2.filled('NA').dtype print ma2.filled(-999).dtype
output: 0.9.9.2538 '|O4' '<f8' '<f8' '<f8'
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