python - How to merge 4 columns based on user-defined criterion -


i need merge 4 columns of array single column

array([[0, 0, 0, 1],        [1, 0, 0, 0],        ...,         [0, 1, 0, 0]])

the result should be:

array([3, 0, ..., 1])

in particular, want column indices (starting 0 , ending 3) columns have value 1.

if every row has unique 1 following work:

 np.where(a == 1)[1]

for example:

>>> = np.array([[0, 0, 0, 1], [1, 0, 0, 0], [0, 1, 0, 0]]) >>> np.where(a == 1)[1] array([3, 0, 1])

we can see following:

>>> np.where(a == 1) (array([0, 1, 2]), array([3, 0, 1]))

array([0, 1, 2]) row indexes having 1 values, , array([3, 0, 1] column indexes. means have 1 values @ coordinates (0, 3), (1, 0), (2, 1). because each row have 1 unique value of one, there 1 column index each row.


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