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MathGroup Archive 2007

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Re: equation trecker questions.

  • To: mathgroup at smc.vnet.net
  • Subject: [mg82017] Re: equation trecker questions.
  • From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
  • Date: Tue, 9 Oct 2007 05:44:05 -0400 (EDT)
  • Organization: The Open University, Milton Keynes, UK
  • References: <fecaea$fsv$1@smc.vnet.net>

sean_incali wrote:

> I was playing with the equation treker that came with GUIKit release.
> 
> When it was first released, I didn' see much use for it, but now I
> have some needs for it at the moment. Well, I coudl live without it,
> but it will help me a lot.
> 
> So the questions are...
> 
> 1. does equation trekker work with algegraic expression like
> polynomials? Because the following doesn't work.
> 
> In[9]:=
> {d= 0.1, c= 1, n= 5};
> 
> EquationTrekker[(b c y-a y^n +c y^6)/(b+y^5), {a, y}, None, PlotRange-
>> {{-10, 10},{-10, 10}}, TrekParameters->{b-> {10, {0,20}},a -> {20,
> {1,100}}}]
> 
>>From In[9]:= EquationTrekker::ncsol: Could not compute the solution
> sol
> 
> Out[10]= $Failed
> 
> What do I need to change u there in order to make it work?
> 
> 2. Does v. 6 have equation trekker and has it changed much at all?

I am not very familiar with the EquationTrekker package, but the 
documentation for version 6 reads, "This package [EquationTrekker] 
provides an interactive tool for investigating the solutions of 
differential equations as well as /other types of equations that have 
solutions that can be viewed as paths or trajectories/." (Emphasize added.)

The following tutorial might be worth reading, especially the section 
titled "Defining your own trek generator" which contains a detailed 
example about visualizing nested procedures.

http://reference.wolfram.com/mathematica/EquationTrekker/tutorial/EquationTrekker.html

Keep in mind, though, that this is part of the documentation for version 
6. I do not know to what extent this can be applied to version 5.2.

Regards,
-- 
Jean-Marc


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