On Mon, Jan 18, 2010 at 2:18 PM, Warren Weckesser <warren.weckesser@enthought.com> wrote:
Ernest Adrogué wrote:
Hi,
This is hard to explain. In this code:
reduce(np.logical_or, [m1 & m2, m1 & m3, m2 & m3])
where m1, m2 and m3 are boolean arrays, I'm trying to figure out an expression that works with an arbitrary number of arrays, not just 3. Any idea??
If I understand the problem correctly, you want the result to be True whenever any pair of the corresponding elements of the arrays are True.
This could work:
reduce(np.add, [m.astype(int) for m in mlist]) > 1
where mlist is a list of the boolean array (e.g. mlist = [m1, m2, m3] in your example).
much nicer than what I came up with. Does iterator instead of intermediate list work (same for my list comprehension)? reduce(np.add, (m.astype(int) for m in mlist)) > 1 Josef
Warren
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