Skip to main content
`Ctrl`+`K`

# numpy.eye

numpy.eye(N, M=None, k=0, dtype=<class 'float'>, order='C', *, device=None, like=None)

  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.

    order{‘C’, ‘F’}, optional

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

    device str, optional

      The device on which to place the created array. Default: None. For Array-API interoperability only, so must be `"cpu"` if passed.

      New in version 2.0.0.

    like array_like, optional

      Reference object to allow the creation of arrays which are not NumPy arrays. If an array-like passed in as `like` supports the `__array_function__` protocol, the result will be defined by it. In this case, it ensures the creation of an array object compatible with that passed in via this argument.

      New in version 1.20.0.

  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

  `identity`

    (almost) equivalent function

  `diag`

    diagonal 2-D array from a 1-D array specified by the user.

  Examples

      >>> import numpy as np
      >>> 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.]])