You wrote:
--- I have matrix (n x3) that represents discrete data. Each row of matrix is 3-D point (x,y,z). I would like to get contour map (z value) at two dimension (x,y). How can I use related contour function to do this job? --- Paul Murrell (paul at stat.auckland.ac.nz) sent me his little clines package some time ago. I will mail you (LZ) a copy (Paul, I assume this is ok?). Dieter