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numpy.matlib.identity

numpy.matlib.identity(n, dtype=None)

Returns the square identity matrix of given size.

Parameters :

n : int

Size of the returned identity matrix.

dtype : data-type, optional

Data-type of the output. Defaults to float.

Returns :

out : matrix

n x n matrix with its main diagonal set to one, and all other elements zero.

See also

numpy.identity

Equivalent array function.

matlib.eye

More general matrix identity function.

Examples

>>> import numpy.matlib
>>> np.matlib.identity(3, dtype=int)
matrix([[1, 0, 0],
        [0, 1, 0],
        [0, 0, 1]])