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# numpy.triu

numpy.triu(m, k=0)

  Upper triangle of an array.

  Return a copy of an array with the elements below the k-th diagonal zeroed. For arrays with `ndim` exceeding 2, `triu` will apply to the final two axes.

  Please refer to the documentation for `tril` for further details.

  See also

  `tril`

    lower triangle of an array

  Examples

      >>> import numpy as np
      >>> np.triu([[1,2,3],[4,5,6],[7,8,9],[10,11,12]], -1)
      array([[ 1,  2,  3],
             [ 4,  5,  6],
             [ 0,  8,  9],
             [ 0,  0, 12]])

      >>> np.triu(np.arange(3*4*5).reshape(3, 4, 5))
      array([[[ 0,  1,  2,  3,  4],
              [ 0,  6,  7,  8,  9],
              [ 0,  0, 12, 13, 14],
              [ 0,  0,  0, 18, 19]],
             [[20, 21, 22, 23, 24],
              [ 0, 26, 27, 28, 29],
              [ 0,  0, 32, 33, 34],
              [ 0,  0,  0, 38, 39]],
             [[40, 41, 42, 43, 44],
              [ 0, 46, 47, 48, 49],
              [ 0,  0, 52, 53, 54],
              [ 0,  0,  0, 58, 59]]])