Chaotic Equation NDSolve....

*To*: mathgroup at smc.vnet.net*Subject*: [mg3127] Chaotic Equation NDSolve....*From*: aspuru at servidor.dgsca.unam.mx*Date*: Tue, 6 Feb 1996 22:48:02 -0500*Organization*: A poorly-installed InterNetNews site*Sender*: owner-wri-mathgroup at wolfram.com

Greetings from Mexico City, 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: The system we programmed is as follows: NDSolve[ {q1'[t] == p1[t], q2'[t] == p2[t], p1'[t] == ((1-f) q1[t])/((1 - q2[t]) ^ 2 + (q1[t]) ^ 2 ) ^ 0.5, p2'[t] == (1-f) - q2[t] - ((1-f) (1-q2[t]))/((1-q2[t]) ^ 2 + (q1[t]) ^ 2) ^ 0.5 , q1 [1] == q2[1] == p1[1] == 1, p2[1] == 2}, {p1, q1, p2, q2}, {t, 1, 20}, MaxSteps->3000 ] And we dont know what is wrong on it... I hope any one of you can guide/help us in our quest of solving this system. Thanks a lot in advance. Alan Aspuru & Octavio Paniagua... Chemistry Faculty, Universidad Nacional Autonoma de Mexico ==== [MESSAGE SEPARATOR] ====