Shouldn't x**0 be boolean for a boolean matrix? Cheers, Alan Isaac
>>> import numpy
>>> numpy.__version__
'1.0.3.1'
>>> x = numpy.mat('1 1;1 0',dtype='bool')
>>> x**0
matrix([[ 1., 0.],
[ 0., 1.]])
>>> x**1
matrix([[ True, True],
[ True, False]], dtype=bool)
>>> x**2
matrix([[ True, True],
[ True, True]], dtype=bool)
>>>
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