Adding value to array

Question

I want to add values from one array to another array after making some calculation, here I did it using for loop but I want efficient way doing so. Please help me.. thanx

from numpy import *

arr = array([1,2,3,4,5])

arr1 = []

for i in arr:

    arr1.append(i+5)
    
print(arr1)

nArray = array(arr1)

print(nArray)

Output :

[6, 7, 8, 9, 10]

[ 6 7 8 9 10]

Simply do arr1 = arr + 5. Numpy broadcasting will take care of the rest. — swag2198
– swag2198, Commented Nov 5, 2020 at 8:10

fountainhead · Accepted Answer · 2020-11-05 08:10:59Z

1

You should have just done:

nArray = arr + 5

answered Nov 5, 2020 at 8:10

fountainhead

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Comments

Thomas Saint-Gérand · Accepted Answer · 2023-04-25 20:14:37Z

1

For a builtin Python list, you can use a list comprehension:

arr1 = [x + 5 for x in arr]

Since you are using a numpy array however, you can just add 5 to the array with:

arr1 = arr + 5

edited Apr 25, 2023 at 20:14

answered Nov 5, 2020 at 8:13

Thomas Saint-Gérand

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2 Comments

Mykola Zotko Over a year ago

Remove the first part. It's correct but not efficient for numpy.

Rohit Over a year ago

Thanx Thomas Saint

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