[Numpy-discussion] logic problem
Mon Jan 18 13:23:56 CST 2010
On Mon, Jan 18, 2010 at 2:18 PM, Warren Weckesser
> Ernest Adrogué wrote:
>> 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
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