numpy.matlib.eye

numpy.matlib.eye(n, M=None, k=0, dtype=<type 'float'>) [source]

Return a matrix with ones on the diagonal and zeros elsewhere.

Parameters:	n : int Number of rows in the output. M : int, optional Number of columns in the output, defaults to n. k : int, optional Index of the diagonal: 0 refers to the main diagonal, a positive value refers to an upper diagonal, and a negative value to a lower diagonal. dtype : dtype, optional Data-type of the returned matrix.
Returns:	I : matrix A n x M matrix where all elements are equal to zero, except for the k-th diagonal, whose values are equal to one.

See also

numpy.eye

Equivalent array function.

identity

Square identity matrix.

Examples

>>> import numpy.matlib
>>> np.matlib.eye(3, k=1, dtype=float)
matrix([[ 0.,  1.,  0.],
        [ 0.,  0.,  1.],
        [ 0.,  0.,  0.]])