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numpy.round_() in Python
  • Last Updated : 04 Dec, 2020

The numpy.round_() is a mathematical function that rounds an array to the given number of decimals.

Syntax : numpy.round_(arr, decimals = 0, out = None)
Parameters :
array : [array_like] Input array.
decimal : [int, optional] Decimal places we want to round off.

Default = 0. In case of -ve decimal, it specifies the n0. of positions to the left of the decimal point.

out : [optional] Output resulted array

Return :



An array with all array elements being
rounded off, having same type as input. 

 
Code #1 : Working

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# Python program explaining
# round_() function
import numpy as np
  
in_array = [.5, 1.5, 2.5, 3.5, 4.5, 10.1]
print ("Input array : \n", in_array)
  
round_off_values = np.round_(in_array)
print ("\nRounded values : \n", round_off_values)
  
  
in_array = [.53, 1.54, .71]
print ("\nInput array : \n", in_array)
  
round_off_values = np.round_(in_array)
print ("\nRounded values : \n", round_off_values)
  
in_array = [.5538, 1.33354, .71445]
print ("\nInput array : \n", in_array)
  
round_off_values = np.round_(in_array, decimals = 3)
print ("\nRounded values : \n", round_off_values)

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Output :

Input array : 
 [0.5, 1.5, 2.5, 3.5, 4.5, 10.1]

Rounded values : 
 [  0.   2.   2.   4.   4.  10.]

Input array : 
 [0.53, 1.54, 0.71]

Rounded values : 
 [ 1.  2.  1.]

Input array : 
 [0.5538, 1.33354, 0.71445]

Rounded values : 
 [ 0.554  1.334  0.714]

 
Code #2 : Working

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# Python program explaining
# round_() function
import numpy as np
  
in_array = [1, 4, 7, 9, 12]
print ("Input array : \n", in_array)
  
round_off_values = np.round_(in_array)
print ("\nRounded values : \n", round_off_values)
  
  
in_array = [133, 344, 437, 449, 12]
print ("\nInput array : \n", in_array)
  
round_off_values = np.round_(in_array, decimals = -2)
print ("\nRounded values upto 2: \n", round_off_values)
  
in_array = [133, 344, 437, 449, 12]
print ("\nInput array : \n", in_array)
  
round_off_values = np.round_(in_array, decimals = -3)
print ("\nRounded values upto 3: \n", round_off_values)

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Output :

Input array : 
 [1, 4, 7, 9, 12]

Rounded values : 
 [ 1  4  7  9 12]

Input array : 
 [133, 344, 437, 449, 12]

Rounded values upto 2: 
 [100 300 400 400   0]

Input array : 
 [133, 344, 437, 449, 12]

Rounded values upto 3: 
 [0 0 0 0 0]

 
References : https://docs.scipy.org/doc/numpy-dev/reference/generated/numpy.round_.html#numpy.round_
.

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