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NumPy | vstack method

schedule Aug 12, 2023
Last updated
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PythonNumPy
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Numpy's vstack(~) method is used to vertically concatenate arrays.

Parameters

1. tup | array-like

The arrays that will concatenated vertically.

Return values

A Numpy array with the provided arrays vertically concatenated.

Examples

Concatenating 1D arrays

x = np.array([1,2,3])
y = np.array([4,5,6])
z = np.vstack([x,y])
z
array([[1, 2, 3],
[4, 5, 6]])

Note that you aren't limited to concatenating just two arrays at once - you can pass in as many as you wish.

Concatenating 2D arrays

x = np.array([[1,2],[3,4]])
y = np.array([[5,6],[7,8]])
z = np.vstack([x,y])
z
array([[1, 2],
[3, 4],
[5, 6],
[7, 8]])

Just to make it easier to process this, here's x and y pretty-formatted:

x = [[1, 2], y = [[5, 6]
[3, 4]] [7, 8]]
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Published by Isshin Inada
Edited by 0 others
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