`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

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

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