How can I solve an ODE that involves a variable parameter?

I need to solve the next ODE:

dT/dz = h*A*(T-t)/(m*cp).

The parameter "A" is also a function of z, A=f(z) and I already know that function so I am able to calculate A for any value of z. By using the solver ode45, the problem is that I don't know at which "z" I need to evaluate the function A since the solver uses a random step to solve the differencial equation. Any suggestions?

[Star Strider]

Significantly more detail would be inestimably helpful!

Answer 1

[Torsten]

The actual value of z is transfered to the function where you define your differential equation. Thus you only have to evaluate A at this specific z:

dTdz = myfun(z,T)
A=@(z)...;
t=...;
m=...;
cp=...;
h=...;
dTdz=h*A(z)*(T-t)/(m*cp)

Best wishes

Torsten.