function a = r8ncf_indicator ( m, n, nz_num, rowcol )

%*****************************************************************************80
%
%% R8NCF_INDICATOR sets up a R8NCF indicator matrix.
%
%  Discussion:
%
%    The R8NCF storage format stores NZ_NUM, the number of nonzeros, 
%    a real array containing the nonzero values, a 2 by NZ_NUM integer 
%    array storing the row and column of each nonzero entry.
%
%    The R8NCF format is used by NSPCG.  NSPCG requires that the information
%    for the diagonal entries of the matrix must come first.
%
%  Licensing:
%
%    This code is distributed under the GNU LGPL license.
%
%  Modified:
%
%    02 August 2006
%
%  Author:
%
%    John Burkardt
%
%  Parameters:
%
%    Input, integer M, N, the number of rows and columns of the matrix.
%
%    Input, integer NZ_NUM, the number of nonzero elements in the matrix.
%
%    Input, integer ROWCOL(2,NZ_NUM), the row and column indices
%    of the nonzero elements.
%
%    Output, real A(NZ_NUM), the nonzero elements of the matrix.
%
  fac = 10^( i4_log_10 ( n ) + 1 );

  for k = 1 : nz_num

    i = rowcol(1,k);
    j = rowcol(2,k);
    a(k) = fac * i + j;

  end

  return
end