numpy.apply_along_axis () in Python

Michael Zippo 18.07.2021

Parameters :

  1d_func:  the required function to perform over 1D array. It can only be applied in 1D slices of input array and that too along a particular axis.  axis:  required axis along which we want input array to be sliced  array:  Input array to work on  * args:  Additional arguments to 1D_function  ** kwargs:  Additional arguments to 1D_function

What are * args and ** kwargs?
Both of them allow variable # to be passed. function arguments.
* args: Allow sending a variable-length argument list without a keyword to the function.

       # Python program illustrating  
  # using * arguments  
   
   args   =   [  3  ,   8  ] 
   a   =   list   (  range   (  *   args)) 
   print   (  "use of args : " , a)

Exit:

 use of args: [3, 4, 5, 6, 7]

** kwargs: allows you to pass a keyword of variable length argument into a function. It is used when we want to process a named argument in a function.

# Python program illustrating
# using ** kwargs

def test_args_kwargs (in1, in2, in3):

print ( "in1:" , in1)

print ( " in2: " , in2)

print ( " in3: " , in3)

kwargs = { "in3" : 1 , "in2" : "No." , "in1" : "geeks" }

test_args_kwargs ( * * kwargs )

Output:

 in1: geeks in2: No. in3: 1

Code 1: Python code explaining the use of numpy.apply_along_axis ().

# Python program illustrating
# apply_along_axis () in NumPy

import numpy as geek

# 1D_func - & quot; geek_fun & quot;

def geek_fun (a):

# Returns the sum of the elements in the initial and last index

# inout array

return (a [ 0 ] + a [ - 1 ])

arr = geek.array ([[ 1 , 2 , 3 ],

[ 4 , 5 , 6 ],

[ 7 , 8 , 9 ]])

"" "

-" [1,2,3] "- 1 + 7

[4,5, 6] 2 + 8

-" [7,8,9] "- 3 + 9

"" "

print ( "axis = 0:" , geek .apply_along_axis (geek_fun, 0 , arr))

print ( " " )

& # 39; & # 39; & # 39; | |

[1,2,3] 1 + 3

[4,5,6] 4 + 6

[7,8,9] 7 + 9

^ ^

"" "

print ( " axis = 1: " , geek.apply_along_axis (geek_fun, 1 , arr))

Output:

 axis = 0: [8 10 12] axis = 1: [ 4 10 16]

Code 2: Sort using apply_along_axis () in NumPy Python

       # Program Python, silt lustrating  
  # apply_along_axis () in NumPy  
   
   import   numpy as geek 
   
   geek_array   =   geek.array ([[  8  ,   1   ,   7  ], 
    [  4  ,   3  ,   9  ],  
    [  5  ,   2  ,   6  ]]) 
   
  # using a predefined sorted function like 1D_func  
   print   ( " Sorted as per axis 1: " , geek.apply_along_axis (  sorted  ,   1  , geek_array)) 
    
   print   ( " "  ) 
   
   print   ( " Sorted as per axis 0: " , geek .apply_along_axis (  sorted  ,   0  , geek_array))

Output:

 Sorted as per axis 1: [[1 7 8] [3 4 9] [2 5 6]] Sorted as per axis 0: [[4 1 6] [5 2 7] [8 3 9]]

Notes:
These NumPy-Python programs will not run by onlineID, so run them on your systems to learn them
,
This article is provided by Mohit Gupta_OMG

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