NumPy

numpy.repeat

numpy.repeat(a, repeats, axis=None)[source]

Repeat elements of an array.

Parameters
aarray_like

Input array.

repeatsint or array of ints

The number of repetitions for each element. repeats is broadcasted to fit the shape of the given axis.

axisint, optional

The axis along which to repeat values. By default, use the flattened input array, and return a flat output array.

Returns
repeated_arrayndarray

Output array which has the same shape as a, except along the given axis.

See also

tile

Tile an array.

Examples

>>> np.repeat(3, 4)
array([3, 3, 3, 3])
>>> x = np.array([[1,2],[3,4]])
>>> np.repeat(x, 2)
array([1, 1, 2, 2, 3, 3, 4, 4])
>>> np.repeat(x, 3, axis=1)
array([[1, 1, 1, 2, 2, 2],
       [3, 3, 3, 4, 4, 4]])
>>> np.repeat(x, [1, 2], axis=0)
array([[1, 2],
       [3, 4],
       [3, 4]])

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