HELP: 'Error: Function definitions are not permitted in this context.'

I'm new to matlab just for you to know.

I'm getting this error on this function:|

function [dydt]=deriv(t,y,a,b,u,df,dr,Fn)

dydt=zeros(2,1);

alphaf=(y(2)+a*y(1))/u-df;                   % Slip Angle Front [rad]
alphar=(y(2)-b*y(1))/u-dr;                   % Slip Angle Rear [rad]

tire_model(niu,Calpha,alphaf,alphar,Fn)      % Lateral Forces [N]

dydt(1)= (1/Izz)*(Fyf*a-Fyr*b);              % Yaw Acelaration
dydt(2)= (1/M)*(Fyf+Fyr)-u*y(1);             % Lateral Acelaration

end

a,b,u,df,dr,Fn are defined in the main script, I noticed that if I define them inside this function it works, but that's not what I pretend.

Thanks in advance

Answer 1

[Azzi Abdelmalek]

If a,b,u,df,dr and Fn are used by your function, you need to define them inside your function, or define them as input arguments.

[snrlax]

Yes, they are. How do I define them as input arguments? I though it was enough putting them like this:

function [dydt]=deriv(t,y,a,b,u,df,dr,Fn)

I don't want to define them inside this function file, that's why.

[Azzi Abdelmalek]

When you call the function, with ode45 for example:

[t,y]=ode45(@(t,y),deriv(t,y,a,b,u,df,dr,Fn),tspan,IC)