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Thanx and another question on plotting


Hi,

Thanks for responses from several gentlemen on my former question on 
constrained plotting.  I used method of ParametricPlot, and it worked well.

The graph is a little bit wrenched.  So I tried to use contour or 
density to show the z value change on x-y plane.  But these two 
functiosn require real number as upper and lower limits.  Have someone 
ever done this before?

Another question is, Can I find the max or min for a non-linear function 
with boundries?  I tried FindMax and ConstrainedMax, both were not working.

Appreciate.

HC


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