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Re: Plot problem

  • To: mathgroup at
  • Subject: [mg3621] Re: Plot problem
  • From: Harald Berndt <haraldb at>
  • Date: Sat, 30 Mar 1996 02:45:29 -0500
  • Organization: University of California Forest Prodcts Lab
  • Sender: owner-wri-mathgroup at

Pierluigi Puccetti wrote:

> f[t_]:=(22.39638707132903 - 38.3879329433359*I)*E^((-0.005 -
> 0.999987499921874*I)*t) +
>   (7.912734995684308 - 0.5556111312856052*I)*Cos[1.1*t] +
>   (-17.89146077765513 + 1.146859050666162*I)*Sin[1.1*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 ?

You can only plot real valued numbers, but Im[x] is a real number. So 
are Abs[x], Arg[x] and Re[x]. Plot either one of these. There are some 
fun ways of plotting two parts of a 2-D vector (like a complex number) 
together, say by encoding the magnitude as height and the phase 
(Arg[]) by color. I believe there is an example in the Mathematica 

Harald Berndt,                                University of California
Research Specialist                         Forest Products Laboratory

Phone:	510-215-4224                                FAX:			510-215-4299


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