function r8gb_print_some ( m, n, ml, mu, a, ilo, jlo, ihi, jhi, title )

%*****************************************************************************80
%
%% R8GB_PRINT_SOME prints some of a banded matrix.
%
%  Discussion:
%
%    An M by N banded matrix A with lower bandwidth ML and upper bandwidth MU
%    is assumed to be entirely zero, except for the main diagonal, and
%    entries in the ML nearest subdiagonals, and MU nearest superdiagonals.
%
%    LINPACK and LAPACK "R8GB" storage for such a matrix generally includes
%    room for ML extra superdiagonals, which may be required to store
%    nonzero entries generated during Gaussian elimination.
%
%    The original M by N matrix is "collapsed" downward, so that diagonals
%    become rows of the storage array, while columns are preserved.  The
%    collapsed array is logically 2*ML+MU+1 by N.
%
%    Only entries in rows ILO to IHI, columns JLO to JHI are considered.
%
%  Licensing:
%
%    This code is distributed under the MIT license.
%
%  Modified:
%
%    21 June 2016
%
%  Author:
%
%    John Burkardt
%
%  Parameters:
%
%    Input, integer M, the number of rows of the matrix.
%    M must be positive.
%
%    Input, integer N, the number of columns of the matrix.
%    N must be positive.
%
%    Input, integer ML, MU, the lower and upper bandwidths.
%    ML and MU must be nonnegative, and no greater than min(M,N)-1..
%
%    Input, real A(2*ML+MU+1,N), the M by N band matrix, stored in LINPACK
%    or LAPACK general band storage mode.
%
%    Input, integer ILO, JLO, IHI, JHI, designate 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 - mu );

    i2hi = min ( ihi, m );
    i2hi = min ( i2hi, j2hi + ml );

    for i = i2lo : i2hi
%
%  Print out (up to) 5 entries in row I, that lie in the current strip.
%
      fprintf ( 1, '%6i  ', i );
      for j = j2lo : j2hi

        if ( mu < j - i || ml < i - j )
          fprintf ( 1, '              ' );
        else
          fprintf ( 1, '%14g', a(i-j+ml+mu+1,j) );
        end

      end

      fprintf ( 1, '\n' );

    end

  end

  return
end
