       Re: Plot problem

• To: mathgroup at smc.vnet.net
• Subject: [mg3645] Re: [mg3589] Plot problem
• From: Robert Pratt <rpratt at math.unc.edu>
• Date: Sun, 31 Mar 1996 00:51:55 -0500
• Sender: owner-wri-mathgroup at wolfram.com

```This is a correction to my previous message.  complexplot should have had
{Re[g], Im[g]} in there instead of {Re[f], Im[f]}.  Also, the parameter
interval [0, 40 Pi] works better than the interval I suggested previously.

Define a function complexplot as follows.

complexplot[g_, a_:0, b_:1, xmin_:-10, xmax_:10, ymin_:-10, ymax_:-10]:=
ParametricPlot[{Re[g], Im[g]}, {t, a, b}, AspectRatio->Automatic,
PlotRange->{{xmin, xmax}, {ymin, ymax}}]

g is the function to be plotted
[a, b] is the parameter interval, with default [0, 1]
xmin, xmax, ymin, ymax define a viewing window, with the given defaults

So to view the plot of your function f[t_], pick a suitable parameter
interval and viewing window.  Try

complexplot[f[t], 0, 40 Pi, -50, 50, -50, 50]

Rob Pratt
Department of Mathematics
The University of North Carolina at Chapel Hill
CB# 3250, 331 Phillips Hall
Chapel Hill, NC  27599-3250

rpratt at math.unc.edu

On Wed, 27 Mar 1996, Pierluigi Puccetti wrote:

> Chiara Mocenni Puccetti
> Universita' di Siena - ITALY
>
> f[t_]:=(22.39638707132903 - 38.3879329433359*I)*E^((-0.005 -
> 0.999987499921874*I)*t) +
>
>
>
> This function is the solutin
> on (obtained with DSolve) of a system of two differential equations.
> There are complex numbers,
> and I am enable to plot this functions in the time variable.
> I am not yet really expert, there is someone that can help me ?
>
> Thanks you
>
> Chiara
>
>

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