function a = r8pbu_zeros ( n, mu )

%*****************************************************************************80
%
%% R8PBU_ZEROS zeros a R8PBU matrix.
%
%  Discussion:
%
%    The R8PBU storage format is for a symmetric positive definite band matrix.
%
%    To save storage, only the diagonal and upper triangle of A is stored,
%    in a compact diagonal format that preserves columns.
%
%    The diagonal is stored in row MU+1 of the array.
%    The first superdiagonal in row MU, columns 2 through N.
%    The second superdiagonal in row MU-1, columns 3 through N.
%    The MU-th superdiagonal in row 1, columns MU+1 through N.
%
%    The matrix returned will be positive definite, but of limited
%    randomness.  The off diagonal elements are random values between
%    0 and 1, and the diagonal element of each row is selected to
%    ensure strict diagonal dominance.
%
%  Licensing:
%
%    This code is distributed under the MIT license.
%
%  Modified:
%
%    03 June 2016
%
%  Author:
%
%    John Burkardt
%
%  Parameters:
%
%    Input, integer N, the order of the matrix.
%
%    Input, integer MU, the number of superdiagonals in the matrix.
%    MU must be at least 0 and no more than N-1.
%
%    Output, real A(MU+1,N), the R8PBU matrix.
%
  a = zeros ( mu + 1, n );

  return
end
