I have 2 numpy arrays and I want whenever element B is 1, the element in A is equal to 0. Both arrays are always in the same dimension:

```
A = [1, 2, 3, 4, 5]
B = [0, 0, 0, 1, 0]

```

I tried to do numpy slicing but I still can't get it to work.

```
B[A==1]=0

```

How can I achieve this in numpy without doing the conventional loop ?