numpy.roll() in Python

numpy.roll(array, shift, axis = None) : Roll array elements along the specified axis. Basically what happens is that elements of the input array are being shifted. If an element is being rolled first to last-position, it is rolled back to first-position.

Parameters : 

array : [array_like][array_like]Input array, whose elements we want to roll
shift : [int or int_tuple]No. of times we need to shift array elements.
        If a tuple, then axis must be a tuple of the same size, and each of the given 
        axes is shifted
        by the corresponding number. 
        If an int while axis is a tuple of ints, then the same value is used for all given axes.
axis  :  [array_like]Plane, along which we wish to roll array or shift it's elements.

Return : 



Output rolled array, with the same shape as a.
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# Python Program illustrating
# numpy.roll() method
   
import numpy as geek
   
array = geek.arange(12).reshape(3, 4)
print("Original array : \n", array)
   
# Rolling array; Shifting one place
print("\nRolling with 1 shift : \n", geek.roll(array, 1))
  
# Rolling array; Shifting five places
print("\nRolling with 5 shift : \n", geek.roll(array, 5))
  
# Rolling array; Shifting five places with 0th axis
print("\nRolling with 5 shift with 0 axis : \n", geek.roll(array, 2, axis = 0))

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Output : 


Original array : 
 [[ 0  1  2  3]
 [ 4  5  6  7]
 [ 8  9 10 11]]

Rolling with 1 shift : 
 [[11  0  1  2]
 [ 3  4  5  6]
 [ 7  8  9 10]]

Rolling with 5 shift : 
 [[ 7  8  9 10]
 [11  0  1  2]
 [ 3  4  5  6]]

Rolling with 5 shift with 0 axis : 
 [[ 4  5  6  7]
 [ 8  9 10 11]
 [ 0  1  2  3]]



References : 

https://docs.scipy.org/doc/numpy-dev/reference/generated/numpy.roll.html


Note : 

These codes won’t run on online-ID. Please run them on your systems to explore the working.

This article is contributed by Mohit Gupta_OMG 😀. 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.


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