numpy.subtract() in Python

• Difficulty Level : Basic
• Last Updated : 10 Feb, 2019

numpy.subtract() function is used when we want to compute the difference of two array.It returns the difference of arr1 and arr2, element-wise.

Syntax : numpy.subtract(arr1, arr2, /, out=None, *, where=True, casting=’same_kind’, order=’K’, dtype=None, subok=True[, signature, extobj], ufunc ‘subtract’)

Parameters :
arr1 : [array_like or scalar]1st Input array.
arr2 : [array_like or scalar]2nd Input array.
dtype : The type of the returned array. By default, the dtype of arr is used.
out : [ndarray, optional] A location into which the result is stored.
-> If provided, it must have a shape that the inputs broadcast to.
-> If not provided or None, a freshly-allocated array is returned.
where : [array_like, optional] Values of True indicate to calculate the ufunc at that position, values of False indicate to leave the value in the output alone.
**kwargs : Allows to pass keyword variable length of argument to a function. Used when we want to handle named argument in a function.

Return : [ndarray or scalar] The difference of arr1 and arr2, element-wise. Returns a scalar if both arr1 and arr2 are scalars.

Code #1 :

 # Python program explaining# numpy.subtract() function  import numpy as geekin_num1 = 4in_num2 = 6  print ("1st Input  number : ", in_num1)print ("2nd Input  number : ", in_num2)    out_num = geek.subtract(in_num1, in_num2) print ("Difference of two input number : ", out_num)
Output :
1st Input number :  4
2nd Input number :  6
Difference of two input number :  -2

Code #2 :

 # Python program explaining# numpy.subtract() function  import numpy as geek  in_arr1 = geek.array([[2, -4, 5], [-6, 2, 0]])in_arr2 = geek.array([[0, -7, 5], [5, -2, 9]])   print ("1st Input array : ", in_arr1)print ("2nd Input array : ", in_arr2)       out_arr = geek.subtract(in_arr1, in_arr2) print ("Output array: ", out_arr)
Output :
1st Input array :  [[ 2 -4  5]
[-6  2  0]]
2nd Input array :  [[ 0 -7  5]
[ 5 -2  9]]
Output array:  [[  2   3   0]
[-11   4  -9]]

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