How to use extra time varying discrete inputs in Ode45?

For example as shown in the function below: Where Ts is the variable with initial value, while Qu is input but it changes with time having specific values defined in the matrix.

function Ts=temp(t,Ts,Qu) Ts=Qu/(1500*4190)-12*10^6/(1500*4190)-11.1*3600*(Ts-20)/(1500*4190);

I am using in this way: Qu=[0 0 0 0 0 0 0 0 21 41 60 75] for j=1:12 Qu=Qu(t); [t,Ts]=ode45(@(t,Ts)temp(t,Ts,Qu),(1:1:12),45) end

But its giving error... please explain how to use inputs with changing time with this example.

Answer 1

[Torsten]

function main
Qu=[0 0 0 0 0 0 0 0 21 41 60 75];
[t,Ts]=ode45(@(t,Ts)temp(t,Ts,Qu),(1:1:12),45) 

function dTdt=temp(t,Ts,Qu)
Qu_actual = interp1(1:1:12,Qu,t);
dTdt = Qu_actual/(1500*4190)-12*10^6/(1500*4190)-11.1*3600*(Ts-20)/(1500*4190);
end

Best wishes

Torsten.

[hassnain iqbal]

Thanks for ur answer...it helps alot :)