spectrochempy.diagonal

diagonal(dataset, offset=0, dim='x', dtype=None, **kwargs)[source]

Return the diagonal of a 2D array.

As we reduce a 2D to a 1D we must specified which is the dimension for the coordinates to keep!.

Parameters:

  • dataset (NDDataset or array-like) – Object from which to extract the diagonal.

  • offset (int, optional) – Offset of the diagonal from the main diagonal. Can be positive or negative. Defaults to main diagonal (0).

  • dim (str, optional) – Dimension to keep for coordinates. By default it is the last (-1, x or another name if the default dimension name has been modified).

  • dtype (dtype, optional) – The type of the returned array.

  • **kwargs – Additional keyword parameters to be passed to the NDDataset constructor.

Returns:

diagonal – The diagonal of the input array.

See also

diag

Extract a diagonal or construct a diagonal array.

Examples

>>> nd = scp.full((2, 2), 0.5, units='s', title='initial')
>>> nd
NDDataset: [float64] s (shape: (y:2, x:2))
>>> nd.diagonal(title='diag')
NDDataset: [float64] s (size: 2)