numpy.eye
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numpy.eye(N, M=None, k=0, dtype=<type 'float'>)
[source] -
Return a 2-D array 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. If None, defaults to
N
.k : int, optional
Index of the diagonal: 0 (the default) refers to the main diagonal, a positive value refers to an upper diagonal, and a negative value to a lower diagonal.
dtype : data-type, optional
Data-type of the returned array.
Returns: I : ndarray of shape (N,M)
An array where all elements are equal to zero, except for the
k
-th diagonal, whose values are equal to one.See also
Examples
>>> np.eye(2, dtype=int) array([[1, 0], [0, 1]]) >>> np.eye(3, k=1) array([[ 0., 1., 0.], [ 0., 0., 1.], [ 0., 0., 0.]])
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https://docs.scipy.org/doc/numpy-1.13.0/reference/generated/numpy.eye.html