function r83v_print_some ( m, n, a, b, c, ilo, jlo, ihi, jhi, title )

%*****************************************************************************80
%
%% R83V_PRINT_SOME prints some of a R83V matrix.
%
%  Discussion:
%
%    The R83V storage format is used for a tridiagonal matrix.
%    The subdiagonal is in A(min(M-1,N)).
%    The diagonal is in B(min(M,N)).
%    The superdiagonal is in C(min(M,N-1)).
%
%  Example:
%
%    An R83V matrix of order 3x5 would be stored:
%
%      B1  C1  **  **  **
%      A1  B2  C2  **  **
%      **  A2  B3  C3  **
%
%    An R83 matrix of order 5x5 would be stored:
%
%      B1  C1  **  **  **
%      A1  B2  C2  **  **
%      **  A2  B3  C3  **
%      **  **  A3  B4  C4
%      **  **  **  A4  B5
%
%    An R83 matrix of order 5x3 would be stored:
%
%      B1  C1  **
%      A1  B2  C2
%      **  A2  B3
%      **  **  A3
%      **  **  **
%
%  Licensing:
%
%    This code is distributed under the MIT license.
%
%  Modified:
%
%    31 January 2016
%
%  Author:
%
%    John Burkardt
%
%  Parameters:
%
%    Input, integer N, the order of the matrix.
%    N must be positive.
%
%    Input, real A(min(M-1,N)), B(min(M,N)), C(min(M+1,N)), the R83V matrix.
%
%    Input, integer ILO, JLO, IHI, JHI, the first row and
%    column, and the last row and column, to be printed.
%
%    Input, string TITLE, a title.
%
  if ( 0 < length ( title ) )
    fprintf ( 1, '\n' );
    fprintf ( 1, '%s\n', title );
  end

  incx = 5;
%
%  Print the columns of the matrix, in strips of 5.
%
  for j2lo = jlo : incx : jhi

    j2hi = j2lo + incx - 1;
    j2hi = min ( j2hi, n );
    j2hi = min ( j2hi, jhi );

    inc = j2hi + 1 - j2lo;

    fprintf ( 1, '\n' );
    fprintf ( 1, '  Col: ' );
    for j = j2lo : j2hi
      fprintf ( 1, '%7d       ', j );
    end
    fprintf ( 1, '\n' );
    fprintf ( 1, '  Row\n' );
    fprintf ( 1, '  ---\n' );
%
%  Determine the range of the rows in this strip.
%
    i2lo = max ( ilo, 1 );
    i2lo = max ( i2lo, j2lo - 1 );
    i2hi = min ( ihi, m );
    i2hi = min ( i2hi, j2hi + 1 );

    for i = i2lo : i2hi
%
%  Print out (up to) 5 entries in row I, that lie in the current strip.
%
      fprintf ( 1, '%5d:', i );

      for j2 = 1 : inc

        j = j2lo - 1 + j2;

        if ( j == i - 1 )
          fprintf ( 1, '%14g', a(i-1) )
        elseif ( j == i )
          fprintf ( 1, '%14g', b(i) )
        elseif ( j == i + 1  )
          fprintf ( 1, '%14g', c(i) )
        else
          fprintf ( 1, '              ' );
        end

      end

      fprintf ( 1, '\n' );

    end

  end

  return
end
