numpy.ma.choose() function – Python

numpy.ma.choose() function use an index array to construct a new array from a set of choices. Given an array of integers and a set of n choice arrays, this method will create a new array that merges each of the choice arrays. Where arr value in arr is i, the new array will have the value that choices[i] contains in the same place.

Syntax : numpy.ma.choose(arr, choices, out = None, mode = ‘raise’)

Parameters :
arr : [ndarray of ints] This array must contain integers in [0, n-1], where n is the number of choices.
choices : [sequence of arrays] Choice arrays. The index array and all of the choices should be broadcastable to the same shape.
out : [array, optional] If provided, the result will be inserted into this array. It should be of the appropriate shape and dtype.
mode : [{‘raise’, ‘wrap’, ‘clip’}, optional] Specifies how out-of-bounds indices will behave. ‘raise’: raise an error. ‘wrap’: wrap around. ‘clip’: clip to the range.

Return : A new array that merges each of the choice arrays.

Code #1 :



filter_none

edit
close

play_arrow

link
brightness_4
code

# Python program explaining
# numpy.ma.choose() function
    
# importing numpy as geek   
# and numpy.ma module as ma  
import numpy as geek  
import numpy.ma as ma
   
choice = geek.array([[1, 1, 1], [2, 2, 2], [3, 3, 3]])
arr = geek.array([2, 1, 0])
  
gfg = geek.ma.choose(arr, choice)
  
print (gfg)

chevron_right


Output :

[3 2 1]

 
Code #2 :

filter_none

edit
close

play_arrow

link
brightness_4
code

# Python program explaining
# numpy.ma.choose() function
    
# importing numpy as geek   
# and numpy.ma module as ma  
import numpy as geek  
import numpy.ma as ma
   
choice = geek.array([[1, 1, 1], [2, 2, 2], [3, 3, 3]])
arr = geek.array([0, 1, 2])
  
gfg = geek.ma.choose(arr, choice)
  
print (gfg)

chevron_right


Output :

[1 2 3]



My Personal Notes arrow_drop_up

Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.


Article Tags :

Be the First to upvote.


Please write to us at contribute@geeksforgeeks.org to report any issue with the above content.