New array with subtracted elements using Python

Question

I want to create a new array which basically consists of elements obtained after subtracting the adjacent elements of I.

import numpy as np
I=np.array([0.42741221, 0.32863457, 0.03597327, 0.23270579, 0.24660262,
       0.28189469, 0.30789726, 0.26947605, 0.11872097, 0.0089662 ,
       0.3677314 , 0.00606158, 0.2923718])

Desired output:

np.array([(0.42741221-0.32863457), (0.32863457-0.03597327), (0.03597327-0.23270579),...])

Please post the code that worked for you below as an answer so that your question can be useful to other users. — D Malan
– D Malan, Commented Feb 21, 2022 at 14:43

user18091161 · Accepted Answer · 2022-02-21 14:44:52Z

1

Using np.diff() helps.

import numpy as np
I=np.array([0.42741221, 0.32863457, 0.03597327, 0.23270579, 0.24660262,
       0.28189469, 0.30789726, 0.26947605, 0.11872097, 0.0089662 ,
       0.3677314 , 0.00606158, 0.2923718])
np.diff(I)

This yields the desired output:

array([-0.09877764, -0.2926613 ,  0.19673252,  0.01389683,  0.03529207,
        0.02600257, -0.03842121, -0.15075508, -0.10975477,  0.3587652 ,
       -0.36166982,  0.28631022])

answered Feb 21, 2022 at 14:44

user18091161

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