solve - unable to find explicit solution

Hi, please help me out

Here is my code:

syms s t X(s) x(t) Xs(s);

ode = diff(x, t, 2) + 2*diff(x, t) + x == cosh(2*t);

L = laplace(ode,t,s);

eqn = subs(L,[laplace(x(t), t, s), subs(diff(x(t), t), t, 0), x(0)],[X, 4, 1])

solve(eqn);

xt=ilaplace(Xs);

I can't use fsolve or vpasolve since I need to take the ILT. By hand I can solve the equation, but matlab conks out for some reason. Any ideas on what to do?

Answer 1

[Paul]

Hi Alexei,

Try to use isolate instead of solve to get an expression for X(s). Also, make sure to take the ilaplace of X(s), not Xs.

If you try and still have a problem, post back with updated code showing where the roadblock is.