Use 'ma.max' instead of 'np.max'. This might be a bug OR an undocumented feature. :-)
import numpy.ma as ma
marr = ma.array(range(10), mask=[0,0,0,0,0,1,1,1,1,1])
np.max(marr)
4 # mask is used
a = []
a.append(marr)
a.append(marr)
np.max(a)
9 # mask is not used
ma.max(a)
4 # mask is used
Kindest regards,
Tim
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