Find multiple values within a Numpy array

Question

I am looking for a numpy function to find the indices at which certain values are found within a vector (xs). The values are given in another array (ys). The returned indice

Answer 1

In this kind of cases, just easily use np.isin() function to mask those elements conform your conditions, like this:

xs = np.asarray([45, 67, 32, 52, 94, 64, 21])
ys = np.asarray([67, 94])

mask=xs[np.isin(xs,xy)]
print(xs[mask])