I apologize in advance if this question is repeated, however I do not think it is.
I have an undamped mass-spring system that has external vibration. It is modeled by the equations below:
I need to write this system in vector form as first order differential equations. Then use ode45 to approxmate the initial value problem solution from 0<t<150 and plot the resulting x(t). This is what I have but I am not sure if this is the right approach:
f = @(t,x)[x(2)+(4*x(1));sin(1.9*t)]
[t,x] = ode45(f,[0,150],[1,0]);