/Python/Np.apply_along_axis third dimension python

Np.apply_along_axis third dimension python

In [131]: A = np.random.randint(0,255,(512,512,3)) # 512x512 colored image

In [132]: def org_app(A):
     ...:     out = np.zeros(A.shape)     
     ...:     for i in range(A.shape[0]):
     ...:         for j in range(A.shape[1]):
     ...:             out[i,j] = chromaticity(A[i,j])
     ...:     return out
     ...: 

In [133]: %timeit org_app(A)
1 loop, best of 3: 5.99 s per loop

In [134]: %timeit np.apply_along_axis(chromaticity, 2, A) #@hpaulj's soln
1 loop, best of 3: 9.68 s per loop

In [135]: %timeit np.log(A/np.power(np.sum(A,2,keepdims=True),1/3))
10 loops, best of 3: 90.8 ms per loop

Source: stackoverflow.com

Numpy apply function to array

import numpy as np

arr = np.array([1,2,3,4])
print(np.apply_along_axis(lambda x : x ** 2, 0, arr))

#Output: array([ 1,  4,  9, 16])

-1

Similar codes

0 vote187 views1 answer
Opencv read gif
Python
12 votes183 views1 answer
Print matrix eleme
Python
19 votes193 views1 answer
Find root directory of jupyter notebook
Python
0 vote209 views1 answer
Python str and repr
Python
8 votes338 views4 answers
Python append to 2d array
Python
0 vote187 views1 answer
Duplicate a list with for loop in python
Python
0 vote193 views1 answer
Converting (YYYY-MM-DD-HH:MM:SS) date time
Python
2 votes256 views1 answer
Sorting rows and columns in pandas
Python
0 vote229 views1 answer
Access host database django docker
Python Django
186 votes296 views6 answers
How to read file in python
Python