Can you help me with ode45?

Hello, I have some problem with my matlab code. I would like to use ode45, but the program gives me the error:

"Not enough input arguments.

Error in file>odefun (line 24)

dydt=5*y

Error in file (line 20)

[t,y] = ode45(odefun,tspan,y0)"

can you help me?

Thanksssss!!!

Ts = 1;
tspan=[0:Ts:10];  % time scale
y0=1; %initial condition
[t,y] = ode45(odefun,tspan,y0)

   function dydt = odefun(t,y)
   dydt = zeros (2,1)
   dydt(1) = y(2);
   dxdt(2) = -3*y(1);

   end

Answer 1

[Walter Roberson]

[t,y] = ode45(@odefun,tspan,y0)

[Michela Longhi]

Thanks for your answer, but if I use

[t,y] = ode45(@odefun,tspan,y0)

the program gives another error :(

"Attempt to execute SCRIPT ode45 as a function:

C:\Users\Michela\Desktop\Systems\ode45.m

Error in file (line 20)

[t,y] = ode45(@odefun,tspan,y0)"

why?

[John D'Errico]

Don't name the script you put your code in ODE45.

[Michela Longhi]

What does you mean? can you make an example, please?

Thanks

[madhan ravi]

It means that you have custom file named ode45.m which thwarts the inbuilt function of MATLAB‘s ode45(). So move your file from MATLAB‘s path or rename it.

[Michela Longhi]

Thank you!!!! It's working now, my file was called file.m but in the same folder there was a file namer ode45.m that disturbed my script.