numpy.identity

numpy.identity(n, dtype=None) [source]

Return the identity array.

The identity array is a square array with ones on the main diagonal.

Parameters:	n : int Number of rows (and columns) in n x n output. dtype : data-type, optional Data-type of the output. Defaults to float.
Returns:	out : ndarray n x n array with its main diagonal set to one, and all other elements 0.

Examples

>>> np.identity(3)
array([[ 1.,  0.,  0.],
       [ 0.,  1.,  0.],
       [ 0.,  0.,  1.]])