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[MUG] fieldplot with non-cartesian coordinates
| [MUG] fieldplot with non-cartesian coordinates |
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Author: Roland Winkler
Posted: Fri, 28 Jun 2002 17:48:04 +0200
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>> From: Roland Winkler "roland.winkler"
Using Maple 8 I tried to generate a fieldplot using polar
coordinates. Unfortunately, I wasn't very successful with the
simplest fieldplots I tried.
In particular, I don't understand: In a fieldplot, the choice of
coordinate system enters twice. First, it affects the variables that
are treated as independent paramters in the plot. Then it affects
also the vector-valued quantity that will be plotted by fieldplot.
To be more specific: Say, we have in cartesian coordinates
> fieldplot ([x,y], x = -1..1, y=-1..1);
What do I have to do to get the same vector field plotted based on
polar coordinates? Neither
> fieldplot ([r,phi], r = 0..1, phi = 0..2*Pi, coords=polar);
nor
> fieldplot ([r*cos(phi),r*sin(phi)], r = 0..1, phi = 0..2*Pi, coords=polar);
seem to do the job.
By the way, the arrows look rather odd in these examples as if the
arrow plotting gets confused by the polar coordinates, too.
Are these bugs? Certainly these things are insufficently documented
in the on-line help.
Roland
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