`numpy.matlib:eye`

Signature

def eye(n, M = None, k = 0, dtype = <class 'float'>, order = C)

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

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.
order : {'C', 'F'}, optional: Whether the output should be stored in row-major (C-style) or column-major (Fortran-style) order in memory.

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.

import numpy.matlib

✓

np.matlib.eye(3, k=1, dtype=float)

✗

matrix([[0., 1., 0.],
        [0., 0., 1.],
        [0., 0., 0.]])