numpy.matlib.eye

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

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

Parameters

nint

Number of rows in the output.

Mint, optional

Number of columns in the output, defaults to n.

kint, 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.

dtypedtype, optional

Data-type of the returned matrix.

order{‘C’, ‘F’}, optional

Whether the output should be stored in row-major (C-style) or column-major (Fortran-style) order in memory.

New in version 1.14.0.

Returns

Imatrix

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.]])