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numpy.searchsorted() in Python

  • Last Updated : 10 Dec, 2018

numpy.searchsorted() function is used to find the indices into a sorted array arr such that, if elements are inserted before the indices, the order of arr would be still preserved. Here, binary search is used to find the required insertion indices.

Syntax : numpy.searchsorted(arr, num, side=’left’, sorter=None)

Parameters :
arr : [array_like] Input array. If sorter is None, then it must be sorted in ascending order, otherwise sorter must be an array of indices that sort it.
num : [array_like]The Values which we want to insert into arr.
side : [‘left’, ‘right’], optional.If ‘left’, the index of the first suitable location found is given. If ‘right’, return the last such index. If there is no suitable index, return either 0 or N (where N is the length of a).
num : [array_like, Optional] array of integer indices that sort array a into ascending order. They are typically the result of argsort.

Return : [indices], Array of insertion points with the same shape as num.

Code #1 : Working






# Python program explaining
# searchsorted() function
   
import numpy as geek
  
# input array
in_arr = [2, 3, 4, 5, 6]
print ("Input array : ", in_arr)
  
# the number which we want to insert
num = 4
print("The number which we want to insert : ", num) 
    
out_ind = geek.searchsorted(in_arr, num) 
print ("Output indices to maintain sorted array : ", out_ind)

Output :

Input array :  [2, 3, 4, 5, 6]
The number which we want to insert :  4
Output indices to maintain sorted array :  2

 
Code #2 :




# Python program explaining
# searchsorted() function
   
import numpy as geek
  
# input array
in_arr = [2, 3, 4, 5, 6]
print ("Input array : ", in_arr)
  
# the number which we want to insert
num = 4
print("The number which we want to insert : ", num)   
  
out_ind = geek.searchsorted(in_arr, num, side ='right'
print ("Output indices to maintain sorted array : ", out_ind)

Output :

Input array :  [2, 3, 4, 5, 6]
The number which we want to insert :  4
Output indices to maintain sorted array :  3

 
Code #3 :




# Python program explaining
# searchsorted() function
   
import numpy as geek
  
# input array
in_arr = [2, 3, 4, 5, 6]
print ("Input array : ", in_arr)
  
# the numbers which we want to insert
num = [4, 8, 0]
print("The number which we want to insert : ", num)   
  
out_ind = geek.searchsorted(in_arr, num) 
print ("Output indices to maintain sorted array : ", out_ind)

Output :

Input array :  [2, 3, 4, 5, 6]
The number which we want to insert :  [4, 8, 0]
Output indices to maintain sorted array :  [2 5 0]

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