Correct use of ode45

Hey,

I have got a problem. I dont understand how to use the ode45 solver.

My prerequisites:

Interval: 48 h

Number of Steps: 5

Increment = Interval/Number of steps = 48/5 = 9.6

This range I called SW

SW = (0:48/5:48)

My equation I want to solve is quite simple:

X = x0*exp((muemax-kd)*t)
For a previous task I already implemented a subfunction 'Wachstumsprozess'

Now I want to approximate with ode45.

-----------------------------------------------------------

function abc

% 1a)
x0 = 0.2;
muemax = 0.06;
kd = 0.01;
t = (0:1:48);
x = Wachstumsprozess (x0, muemax, kd, t);
plot (t,x);

% 2a)
SW = (0:48/5:48);
[SW,x2] = Euler(@(SW,x2)Wachstumsprozess(x0, muemax, kd, t), SW, x0);

end

function X = Wachstumsprozess (x0, muemax, kd, t)
    X = x0*exp((muemax-kd)*t);
end

function E = Euler (Fkt, SW, Y0)
    E = ode45(Fkt, SW, Y0);
end