a=numpy.ones((2,2))
>>> numpy.minimum.outer(a,a)
array([[[[ 1., 1.],
[ 1., 1.]],
[[ 1., 1.],
[ 1., 1.]]],
[[[ 1., 1.],
[ 1., 1.]],
[[ 1., 1.],
[ 1., 1.]]]])
>>> numpy.ma.minimum.outer(a,a)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/lgm/cdat/latest/lib/python2.5/site-packages/numpy/ma/core.py",
line 3317, in outer
result._mask = m
AttributeError: 'numpy.ndarray' object has no attribute '_mask'
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