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# NumPy | diag method

schedule Aug 12, 2023
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Numpy's `diag(~)` method returns the diagonal of the input array.

# Parameters

1. `a` | `array-like`

The input array.

2. `k` | `int` | `optional`

If `k` is positive, the next diagonal on the top will be returned instead. If negative, then the diagonal on the bottom will be returned. By default, `k=0`.

# Return value

The diagonals of the input array.

# 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 get the main diagonal:

``` np.diag(a) array([1, 5, 9]) ```

To get the diagonal with `k=1`:

``` np.diag(a, k=1) array([2, 6]) ```

To get the diagonal with `k=-2`:

``` np.diag(a, k=-2) array([7]) ```
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