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# NumPy | flipud method

schedule Aug 12, 2023
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NumPy's `flipud(~)` method reverses the ordering of the elements row-wise (vertical flip). Note that this method does not flip bits (i.e. turns 0s into 1s, and 1s into 0s).

This method is equivalent to `np.flip(a, axis=0)`, where `a` is the input array.

# Parameters

1. `a` | `array-like`

The input array.

# Return value

A NumPy array with the input elements reversed row-wise.

# Examples

Consider the following 2D array:

``` a = np.array([[1,2,3],[4,5,6],[7,8,9]])a array([[1, 2, 3],       [4, 5, 6],       [7, 8, 9]]) ```

To reverse the ordering of the elements row-wise:

``` np.flipud(a) array([[7, 8, 9],       [4, 5, 6],       [1, 2, 3]]) ```

Here, the first row became the last element.

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