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[Q] solving ODE with rk45, gear,...
Posted:
Oct 1, 1996 3:17 PM


Hello,
I am trying to solve a rather complex set of ODE and as to now I managed to do something with ode23 and ode45. Both give results which are acceptable but I also would like to check the GEAR method. There is a gear algoritm implemented (gear) and everything would be fine if I knew how to write my set of ODEs so that it is understood by gear (or rk45). I saw the example function but truly speaking I didn't understand it at all :}
I would be grateful if someone could write me how to code the following set of ODE (in the form of the parameter SYSTEM) so that it can be understood by those functions.
Let A = A(t), B = B(t) dA/dt = A  B dB/dt = A * B
Thank you for replaying by email  I have a poor news feedback and do not want to miss any solution/pointer. I will summarise if there is any interest.
Best Regards, Wojtek   Wojtek Swiatek, AGH, Dept. of HighEnergy Physics, Krakow, Poland   CERN, Geneva, Switzerland DESY, Hamburg, DE   swiatek@ftj.agh.edu.pl   swiatek@cern.ch ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  swiatek@desy.de  GREENPEACE lives !   GS(GSC) c++(++++) u++() e++ m+ s+/ n++ h(++) f g+ t r+ http://www.ftj.agh.edu.pl/~swiatek/



