# scipy.linalg.tril

scipy.linalg.tril(m, k=0)

  Make a copy of a matrix with elements above the kth diagonal zeroed.

  Parameters
    m array_like

      Matrix whose elements to return

    k int, optional

      Diagonal above which to zero elements. k == 0 is the main diagonal, k < 0 subdiagonal and k > 0 superdiagonal.

  Returns
    tril ndarray

      Return is the same shape and type as m.

  Examples

      >>> from scipy.linalg import tril
      >>> tril([[1,2,3],[4,5,6],[7,8,9],[10,11,12]], -1)
      array([[ 0,  0,  0],
             [ 4,  0,  0],
             [ 7,  8,  0],
             [10, 11, 12]])

scipy.linalg.khatri_rao scipy.linalg.triu