How can i solve this function below ?

To solve a second order differential equation : dx/dt = Ax + Bu(t) I use this function but i haven't obtain any result :

function xdot = msd(t,x)
% Function file for mass with spring and damping.
% Position is first variable, velocity is second variable.
u = 10;
m = 1;c = 2;k = 5;
A = [0, 1;-k/m, -c/m];
B = [0; 1/m];
xdot = A*x+B*u;
[t, x] = ode45(@msd, [0,5], [0,0];

Answer 1

[Azzi Abdelmalek]

Save the function below as msd.m

function xdot = msd(t,x)
% Function file for mass with spring and damping.
% Position is first variable, velocity is second variable.
u = 10;
m = 1;c = 2;k = 5;
A = [0, 1;-k/m, -c/m];
B = [0; 1/m];
xdot = A*x+B*u;

then in Matlab Windows Command write

[t, x] = ode45(@msd, [0,5], [0,0]);
plot(t,x)

[Mallouli Marwa]

But there is an error in this line : xdot = A*x+B*u;

[Torsten]

Use

[t, x] = ode45(@msd, [0,5], [0;0]);

Best wishes

Torsten.

[Gokul Prassad S]

it was very useful Mr. Torsten. Can you please explain

[t, x] = ode45(@msd, [0,5], [0;0]);

I want to understand the reason behind using this code.

Kindly help.