solve - unable to find explicit solution

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Alexei Davydenko
Alexei Davydenko 2023-2-4
回答： Paul 2023-2-4
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?

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回答（1 个）

Paul
Paul 2023-2-4
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.

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