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Re: Chaotic Equation NDSolve....

  • To: mathgroup at
  • Subject: [mg3149] Re: [mg3127] Chaotic Equation NDSolve....
  • From: Richard Mercer <richard at>
  • Date: Fri, 9 Feb 1996 02:59:59 -0500
  • Sender: owner-wri-mathgroup at

>  We are a pair of students of chemistry doing some
>  exercises on chaotic systems.  So we are not too keen on
>  math as a mathematician would be.

>  We programmed this system and get this error:
>  "Differential Equation does not evaluate as a number at
>  t=1" Tried with different values of t with no success:

Since you have not defined the variable f, you are asking Mathematica  
to numerically solve a systems of diff. equations with an undetermined  

This is equivalent to asking for the numerical integral of sin(a x^2)  
from 0 to 1. You can't do it because there are no numbers to work with  
until you know what a is! The same problem applies in your case.
Choose a value for f and then try it. (I don't have time.)

Richard Mercer


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