python - Numpy array, specifiyng what elements to return -

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say have following 5x5 numpy array called a

array([[6, 7, 7, 7, 8],        [4, 2, 5, 5, 9],        [1, 2, 4, 7, 4],        [0, 7, 3, 6, 8],        [4, 9, 6, 1, 6]])

and 5x5 array called f

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

i've been trying use np.copyto, can't wrap head around why not working/how works.valueerror: not broadcast input array shape (5,5) shape (2)

is there easy way values of matching integers have corresponding 1 in f when laid on a? e.i return, 6,4,1,0

you can little trick: a[f==1]

in [8]:  a[f==1] out[8]: array([6, 4, 1, 0])

check out boolean indexing


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