       Help with ParametricPlot3D in color

• To: mathgroup at smc.vnet.net
• Subject: [mg4416] Help with ParametricPlot3D in color
• From: ivan at nauplius.rsmas.miami.edu (Ivan Lima)
• Date: Sun, 21 Jul 1996 23:09:17 -0400
• Organization: RSMAS/University of Miami
• Sender: owner-wri-mathgroup at wolfram.com

```I'm trying to plot some phase portraits of a three-dimensional system
with ParametricPlot3D and I'd like it to plot the lines in
color. After two days looking at the manuals I can't find any way to
do that. Does anybody know how to do that?  Sorry for posting such a
stupid question. I'm kind of new to Mathematica graphics and any
help will be appreciated

Bellow are the commands I'm using.

In:= NDSolve[{x'[t] == r x[t] - c x[t]^2 - g (x[t]/(x[t]+h)) y[t],
y'[t] == g (x[t]/(x[t]+h)) y[t] e - m y[t] - p (y[t]/(y[t]+i)) z[t],
z'[t] == p (y[t]/(y[t]+i)) z[t] e - n z[t],
x == 0.1, y == 0.1, z == 0.1},
{x, y, z}, {t, 0, 20000}, MaxSteps->250000]

Out= {{x -> InterpolatingFunction[{0., 20000.}, <>],

>     y -> InterpolatingFunction[{0., 20000.}, <>],

>     z -> InterpolatingFunction[{0., 20000.}, <>]}}

In:= ParametricPlot3D[Evaluate[{x[t],y[t],z[t]} /. %],
{t, 100, 20000}, PlotPoints -> 20000,
PlotRange -> {{0, 6}, {0, 2}, {0, 1}},
ColorOutput -> RGBColor,
ViewPoint -> {1.3, 2.4, 2.}]
Out= -Graphics3D-

Thanks

Ivan
--
/|
Ivan Lima                                           | O   __/ |_
Rosenstiel School of Marine and Atmospheric Science |  o /o     \_/|
Division of Marine Biology and Fisheries            |   (    <   _ |
ivan at nauplius.rsmas.miami.edu                       |    \__   _/ \|
http://nauplius.rsmas.miami.edu/homepage/home.html  |       \_|

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```

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