Extract elements from numpy array, that are not in list of indexes

Question

I want to do something similar to what was asked here NumPy array, change the values that are NOT in a list of indices, but not quite the same.

Consider a nump

Answer 1

One approach with np.in1d to create the mask of the ones from indxs present and then inverting it and indexing the input array with it for the desired output -

a[~np.in1d(np.arange(a.size),indxs)]