Numpy int array: Find indices of multiple target ints

Question

I have a large numpy array (dtype=int) and a set of numbers which I\'d like to find in that array, e.g.,

import numpy as np
values = np.array(         


        

Answer 1

Can you avoid numpy all together? List concatenation should be much faster than relying on numpy's methods. This will still work even if values needs to be a numpy array.

result = []
for sv in searchvals:
    result += [i for i in range(len(values)) if values[i] == sv]