Extract values from array based on multiple values conditions

Question

I have an array of floats. I want to select its values based on multiple conditions:

import numpy as np
stamps = np.linspace(1., 100., 1e3)  
selected_stamps = stamps[((stamps > 2.)& (stamps < 10) & (stamps > 20.)& (stamps < 31) & (stamps > 80.)& (stamps < 95) )] # select only values within 2-10, 20-31, 80-95

How do I do that?

Is the posted solution working? If so, what improvements are you looking for? — Divakar
– Divakar, Commented Apr 23, 2020 at 19:12

Gilad Green · Accepted Answer · 2020-04-23 19:12:50Z

1

If you use only and operators as you did you will get an empty collection. You have 3 ranges, so between each range you need an or operator:

selected_stamps = stamps[(
    ((stamps > 2.) & (stamps < 10)) | 
    ((stamps > 20.)& (stamps < 31)) | 
    ((stamps > 80.)& (stamps < 95)) )]

answered Apr 23, 2020 at 19:12

Gilad Green

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