help with contourplot 3d

• To: mathgroup at smc.vnet.net
• Subject: [mg43466] help with contourplot 3d
• From: Michael Alfaro <malfaro at ucsd.edu>
• Date: Wed, 17 Sep 2003 08:00:12 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

```Hi,

I am trying to plot a contour that is a function of 3 variables, x, y,
and z.  I am plotting the function over a biologically interesting
range of values using ContourPlot3d.  The problem is that the function
does not give real values over some parts of the space near an edge.
When I try to plot, mathematica
shows these lines in blue
CompiledFunction::"cfn": "Numerical error encountered at instruction \
\!\(52\); proceeding with uncompiled evaluation."

General::"stop": "Further output of \!\(CompiledFunction :: \"cfn\"\)
will be \
suppressed during this calculation."

and

ContourPlot3D::"gval": "Function value \!\(\(\(-0.6727485829490804`\)\)
- \
\(\(0.22711205859697875`\\ \[ImaginaryI]\)\)\) at grid point x =
\!\(0.19`\), \
y = \!\(0.29`\), z = \!\(0.28`\) is not a real number."

The plot that mathematica produces looks good except for one edge which
is jagged!  As I tell mathematica to plot more points, the size of the
jags diminishes.  However I am reaching the practical limit of plot
points (25) in terms of time and screen resolution and that edge is
still not smooth like I expect that it really is (after plotting points
from a numerical simulation).

I would like to get a smooth plot somehow for this function.  Is there
anything else I can try?  I am new to mathematica.  Is there anyway to
say, in the function for example, that only real numbers are valid?  Or
will any of the ContourPlot3D options like min/max recursion or
singularity help?

Thanks for any assistance!

Michael

```

• Prev by Date: Trouble importing Mathematica EPS files into Deneba Canvas
• Next by Date: 14MB image very quickly exhausts 512MB RAM.
• Previous by thread: Re: Re: Trouble importing Mathematica EPS files into Deneba Canvas
• Next by thread: Re: help with contourplot 3d