II am using Plot3D to visualise a complicated surface. The parameters are c and t (t is an angle in degrees).The surface consists of recurring peaks. The highest peak occurs at tan t = 0,5 and c=- 0. So far so good. Bur this highest peak should be 200 units high. Yet it appears much shorter. Why? i have (I think) suppressed the check for machine underflow. Please help. Many thanks. Bob Frenkel. Email is frenkelfamily@hotmail.com One attachment
Plot3DRegularSteps.nb (182 KB)
I think this is a sampling issue. You can look at the PlotPoints options (for example, try PlotPoints->100). Also, you don’t really need all of the N[...,$MachinePrecision] functions. Every time you have a number with a decimal point (e.g. the various 0.5 and 1.0 and so forth), that whole expression will already be at machine precision.
Many thanks Eric. I put :PlorPoints → 100 and PlotRange->{0,200} and the output is what I expected.
Also I removed the needless machine precision statements, as you recommended.
All best wishes
Bob Frenkel.