Combine list of list of booleans based on AND or OR condition

Question

For combining two lists of booleans based on OR, np.logical_or can be used, and similarity AND can be done with np.logical_and.

However, if I have a list of 10 lists of boolean values and want to combine them using either AND or OR, I cannot find an easy way to do this.

Could you please suggest the most efficient way?

EDIT:

booleans = [[True, True, False, True, False], [True, False, False, False, False], [True, False, False, False, False]]

OR output: [True, True, False, True, False]

AND output: [True, False, False, False, False]

Thanks, Jack

If you're want a NumPy array as output, use `numpy.logical_and.reduce` - or more generally [`ufunc.reduce`](https://docs.scipy.org/doc/numpy/reference/generated/numpy.ufunc.reduce.html). — miradulo, Aug 03 '18 at 13:18
Possible duplicate of [Numpy \`logical\_or\` for more than two arguments](https://stackoverflow.com/questions/20528328/numpy-logical-or-for-more-than-two-arguments) — jfowkes, Aug 03 '18 at 13:20
@miradulo @jfowkes If I do that, I get an error `TypeError: Internal Numpy error: too many arguments in call to PyUFunc_HasOverride`. I am combining around 500 of these boolean lists with or operator (`np.logical_or.reduce(*list_)`) — Jack Arnestad, Aug 03 '18 at 13:23
@JackArnestad Don't unpack the list in your call. Also, is your intent indeed to use NumPy here? — miradulo, Aug 03 '18 at 13:24
I commented because if OP is using NumPy this is a many-times-over duplicate. `np.any` and `np.all` are accomplishing the same thing as well. — miradulo, Aug 03 '18 at 14:09

score 8 · Answer 1 · answered Aug 03 '18 at 13:23

8

Here is a solution without numpy

>>> booleans = [[True, True, False, True, False], [True, False, False, False, False], [True, False, False, False, False]]
>>> or_output = list(map(any, zip(*booleans)))
>>> and_output = list(map(all, zip(*booleans)))
>>> 
>>> print (or_output)
[True, True, False, True, False]
>>> print (and_output)
[True, False, False, False, False]
>>>

answered Aug 03 '18 at 13:23

Sunitha

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Bonus if you can show how you're just passing a function `f` into the surrounding structure of the `map`. – wheaties Aug 03 '18 at 13:35
@wheaties This solution also zips the list twice, when it can easily be done once. – RoadRunner Aug 03 '18 at 13:51
@RoadRunner From the question "_using either AND or OR_" - doing both at once doesn't seem necessary. – miradulo Aug 03 '18 at 14:04

Combine list of list of booleans based on AND or OR condition

1 Answers1