Python NumPy - Stack an Array Vertically and Tile Array n Times

By IncludeHelp Last updated : September 11, 2024

Problem Statement

Suppose that we are going with a NumPy array and we need to create a new array where the input array is tiled n times along the first axis and stacked vertically.

Stacking an Array Vertically and Tile Array n Times

To stack an array vertically and tile the array n times, first use the numpy.tile() function to tile the input array n times along the first axis, and stores the result in a variable. We will then use numpy.row_stack() to stack the tiled array vertically, and stores the result in another variable.

Python Code to Stack an Array Vertically and Tile Array n Times

Let us understand with the help of an example:

# Importing numpy
import numpy as np

# Creating an array
arr = np.array([1, 2, 3, 4])

# Display original array
print("Original array", arr,"\n")

# Defining a value for n
n = 3

# Tile the input array n times along the first axis
tiled_arr = np.tile(arr, (n, 1))

# Stack the tiled array vertically
res = np.row_stack(tiled_arr)

# Display result
print("Result:\n",res,"\n")

Output

The output of the above program is:

Original array [1 2 3 4] 

Result:
 [[1 2 3 4]
 [1 2 3 4]
 [1 2 3 4]]