Python | Selective value selection in list of tuples

Python | Find elements within range in numpy

Last Updated : 12 Mar, 2019

Given numpy array, the task is to find elements within some specific range. Let’s discuss some ways to do the task.

Method #1: Using np.where()

# python code to demonstrate 
# finding elements in range 
# in numpy array 
import numpy as np 
  
ini_array = np.array([1, 2, 3, 45, 4, 7, 810, 9, 6]) 
  
# printing initial array 
print("initial_array : ", str(ini_array)); 
  
# find elements in range 6 to 10 
result = np.where(np.logical_and(ini_array>= 6, ini_array<= 10)) 
  
# printing result 
print("resultant_array : ", result) 

Output:

initial_array :  [  1   2   3  45   4   7 810   9   6]
resultant_array :  (array([5, 7, 8]),)

Method #2: Using numpy.searchsorted()

# Python code to demonstrate 
# finding elements in range 
# in numpy array 
  
import numpy as np 
  
ini_array = np.array([1, 2, 3, 45, 4, 7, 9, 6]) 
  
# printing initial array 
print("initial_array : ", str(ini_array)); 
  
  
# find elements in range 6 to 10 
start = np.searchsorted(ini_array, 6, 'left') 
end = np.searchsorted(ini_array, 10, 'right') 
result = np.arange(start, end) 
  
# printing result 
print("resultant_array : ", result) 

Output:

initial_array :  [ 1  2  3 45  4  7  9  6]
resultant_array :  [5 6 7]

Method #3: Using *

# Python code to demonstrate 
# finding elements in range 
# in numpy array 
  
import numpy as np 
  
ini_array = np.array([1, 2, 3, 45, 4, 7, 9, 6]) 
  
# printing initial array 
print("initial_array : ", str(ini_array)); 
  
  
# find elements in range 6 to 10 
result = ini_array[(ini_array>6)*(ini_array<10)] 
  
# printing result 
print("resultant_array : ", result) 

Output:

initial_array :  [ 1  2  3 45  4  7  9  6]
resultant_array :  [7 9]

Python | Selective value selection in list of tuples

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