python - How to generate a bool 2D arrays from two 1D arrays using numpy -


i have 2 arrays a=[1,2,3,4] , b=[2,3]. wondering there efficient way construct boolean 2d array c (2d matrix, i.e. 2*4 matrix) based on array element comparsions, i.e. c[0,0] = true iff a[0] == b[0]. basic way iterate through elements of a , b, think there maybe better using numpy. checked numpyreference, not find routine that.

thanks

if understood question correctly, can extend dimensions of b np.newaxis/none form 2d array , perform equality check against a, bring in broadcasting vectorized solution, -

b[:,none] ==

sample run -

in [5]: out[5]: array([1, 2, 3, 4])  in [6]: b out[6]: array([2, 3])  in [7]: b[:,none] == out[7]:  array([[false,  true, false, false],        [false, false,  true, false]], dtype=bool)

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