NumPy repeat()

repeat() Syntax

The syntax of repeat() is:

numpy.repeat(array, repetitions, axis)

repeat() Arguments

The repeat() method takes three arguments:

• array - an array with elements to be repeated
• repetitions - number of times the element repeats
• axis(optional) - axis along which to repeat the elements of the array

repeat() Return Value

The repeat() method returns the array with repeated elements.

Example 1: numpy.repeat()

Output

[0 0 0 1 1 1 2 2 2 3 3 3]

Here, the 2D array array1 is first fattened and each of its elements is repeated thrice.

Example 2: numpy.repeat() With Axis

In case of multi-dimensional arrays, we can use the axis parameter to specify the axis along which the repetition should take place.

When the axis is 0, rows of the array repeat vertically. And, when the axis is 1, columns repeat horizontally.

Let's see an example.

Output

Along axis 0
[[0 1]
 [0 1]
 [2 3]
 [2 3]]
Along axis 1
 [[0 0 1 1]
 [2 2 3 3]]

Example 3: Uneven Repetition

Examples so far repeat every element of the array a fixed number of times.

However, we can repeat different elements by different amounts.

Output

[0 0 1 1 1 2 3 3]

Here, the first element(0) repeats 2 times, the second element(1) repeats 3 times, and so on.

Example 4: Array Creation Using Repeat

We can also create arrays using repeat().

Output

[3 3 3 3]