Hello , i have a a set of undefined functions phi1(t) , phi2(t) , phi3(t) and i would like to use them as variables throughout my calculations without having that red undefined functions set.
The objectives of the worksheet;
- define f(x,t)=phi(t) * g(x,t)
- compute some intermediate KE , Ums , Ubs with f(x,t)
-assemble KE , UMS , UBS in L(t) -- > L(t):= K2*phi(t)^2+K1*phi(t)+K1*phi^2(t)+K0d/dt(phi(t))
- find d/dt( phi(t)) in L(t)
-use result to compute D(t,phi) ---> can't extract from "find" array
- solve using RKadapt
What puzzles me more is that computations are working fine from the start and it stops working right where i need it most.