numpy.matlib.eye¶
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numpy.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: 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.
New in version 1.14.0.
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.
Examples
>>> import numpy.matlib >>> np.matlib.eye(3, k=1, dtype=float) matrix([[ 0., 1., 0.], [ 0., 0., 1.], [ 0., 0., 0.]])