🚀 go-pugleaf

In article <bw1tvcl@rpi.edu> leecj@vega.cs.rpi.edu (Ching-ju Lee) writes:
> 
>I need recent(1980 or later) references on finding contour
>lines(level sets) given the function in a closed functional 
>form, or only a set of function values on a grid.  
> 

I would suggest looking in the ACM Transactions on Mathematical Software 
over the last 12 years or so.  There have been numerous really excellent
contour algorithms written up in there, including TRICP and its offspring.
The code for these algorithms is available free over NETLIB.  I have used
the TRICP algorithm extensively over the last many years for producing
contour plots of stress, density, etc... in solid impact dynamics problems.
It has proven both accurate, affordable, and amazingly rugged.  There have
been numerous articles in more recent years that seem even better, including
algorithms for three dimensional plotting.

I would also suggest looking at what is available from GNU and from the
National Center for Supercomputing Applications.  Both have contour packages
available.  I don't know much about GNUplot, but the NCSA stuff is pretty
high class. 

John 
-- 
John K. Prentice                      | "We must make good the demands of
Department of Physics And Astronomy   | reason and create a life worthy of
University of New Mexico              | ourselves and of the goals we only
john@aquarius.unm.edu                 | dimly perceive."  - Andrei Sakharov