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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.]])