
Re: System of differential equations
Posted:
Dec 7, 2012 1:37 AM


I found that converting your input cell to TraditionalForm and then back again to StandardForm  thus causing the terms in the differential equations to be reorganised  made NDSolve work though you now get a "NDSolve::mxst: Maximum number of 10000 steps reached ..." warning message.
Stephen Luttrell West Malvern, UK
On Thursday, 6 December 2012 09:56:30 UTC, hazem.ab...@gmail.com wrote: > Dear all, > > I want to solve this system of equations but I always get an error > > > > NDSolve::ndnum:Encountered nonnumerical value for a derivative at t==0 > > > > can any one help me on this > > > > s=NDSolve[{ > > ph1''[t]+ph1'[t]+sin[ph1[t]]mu[t]mu'[t]==0.005, > > ph2''[t]+ph2'[t]+sin[ph2[t]]+mu[t]+mu'[t]==0.005, > > 0.2mu'[t]+mu[t]==ph1'[t]ph2'[t], > > ph2[0]==0, > > ph1[0]==0, > > ph2'[0]==0, > > ph1'[0]==0, > > mu[0]==0 > > }, > > {ph1[t],ph2[t],mu[t]}, > > {t,0,5000} > > ] > > > > thanks in advance,

