numpy.hstack() in Python

• Difficulty Level : Basic
• Last Updated : 06 Jan, 2019

numpy.hstack() function is used to stack the sequence of input arrays horizontally (i.e. column wise) to make a single array.

Syntax : numpy.hstack(tup)

Parameters :
tup : [sequence of ndarrays] Tuple containing arrays to be stacked. The arrays must have the same shape along all but the second axis.

Return : [stacked ndarray] The stacked array of the input arrays.

Code #1 :

 # Python program explaining# hstack() function  import numpy as geek  # input arrayin_arr1 = geek.array([ 1, 2, 3] )print ("1st Input array : \n", in_arr1)   in_arr2 = geek.array([ 4, 5, 6] )print ("2nd Input array : \n", in_arr2)   # Stacking the two arrays horizontallyout_arr = geek.hstack((in_arr1, in_arr2))print ("Output horizontally stacked array:\n ", out_arr)
Output:
1st Input array :
[1 2 3]
2nd Input array :
[4 5 6]
Output horizontally stacked array:
[1 2 3 4 5 6]

Code #2 :

 # Python program explaining# hstack() function  import numpy as geek  # input arrayin_arr1 = geek.array([[ 1, 2, 3], [ -1, -2, -3]] )print ("1st Input array : \n", in_arr1)   in_arr2 = geek.array([[ 4, 5, 6], [ -4, -5, -6]] )print ("2nd Input array : \n", in_arr2)   # Stacking the two arrays horizontallyout_arr = geek.hstack((in_arr1, in_arr2))print ("Output stacked array :\n ", out_arr)
Output:
1st Input array :
[[ 1  2  3]
[-1 -2 -3]]
2nd Input array :
[[ 4  5  6]
[-4 -5 -6]]
Output stacked array :
[[ 1  2  3  4  5  6]
[-1 -2 -3 -4 -5 -6]]

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