.tile()

In NumPy, the .tile() function constructs a new array by repeating the input array A according to the specified number of repetitions reps.

• If A.ndim < len(reps), dimensions of A are promoted by prepending ones to match the length of reps. For example, an array with shape (3,) will be treated as (1, 3).
• If A.ndim > len(reps), the reps tuple is extended by prepending ones. For example, reps=2 is treated as (1, 2).

Syntax

numpy.tile(A, reps)

Parameters:

• A: The input array.
• reps: The number of times the values need to be repeated.

Return value:

Returns a new array containing the input array’s elements repeated a specific number of times.

Example: Repeating Elements in 1D, 2D, and 3D Arrays

The following example shows how 1D, 2D, and 3D arrays interact with .tile():

import numpy as np

# Create a 1D array
a = np.array([3,2,1])
print("Shape of a:",np.shape(a))
print("a:",a)

# Use .tile() to repeat the values twice horizontally
b = np.tile(a,2)
print("b:",b)

# Use .tile() to create a 2D array
c = np.tile(a,(1,2))
d = np.tile(a,(2,1))
print("c:",c)
print("d:",d)

# Use .tile() to create a 3D array
e = np.tile(a,(2,1,2))
print("e:",e)

print("\n\n")

# Create a 2D array
m = np.array([[5,7,8],[8,2,0]])
print("Shape of m:",np.shape(m))
print("m:",m)

# Use .tile() to repeat the values twice horizontally
n = np.tile(m,2)
print("n:",n)

# To repeat the values horizontally only
o = np.tile(m,(1,2))
print("o:",o)

# To repeat the values horizontally and vertically
p = np.tile(m,(2,2))
print("p:",p)

# To create a 3D array
q = np.tile(m,(2,1,2))
print("q:",q)

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This produces the following output:

Shape of a: (3,)
a: [3 2 1]
b: [3 2 1 3 2 1]
c: [[3 2 1 3 2 1]]
d: [[3 2 1]
 [3 2 1]]
e: [[[3 2 1 3 2 1]]

 [[3 2 1 3 2 1]]]



Shape of m: (2, 3)
m: [[5 7 8]
 [8 2 0]]
n: [[5 7 8 5 7 8]
 [8 2 0 8 2 0]]
o: [[5 7 8 5 7 8]
 [8 2 0 8 2 0]]
p: [[5 7 8 5 7 8]
 [8 2 0 8 2 0]
 [5 7 8 5 7 8]
 [8 2 0 8 2 0]]
q: [[[5 7 8 5 7 8]
  [8 2 0 8 2 0]]

 [[5 7 8 5 7 8]
  [8 2 0 8 2 0]]]

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Codebyte Example: Practical Usage of .tile()

The following codebyte example shows the usage of the .tile() function:

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