getting "Not enough Input arguments" for this code. Can some one help

function yp=qcar(t,z)
    M=1000;
    m=100;
    Cs=1000;
    Ks=36000;
    Kt=360000;
    R=150;
   yp=zeros(4,1);
   yp(1)=z(2);
   yp(2)=-1/M*[Ks(z(1)-z(3))+Cs(z(2)-z(4))];
   yp(3)=z(4);
   yp(4)=-1/m*[Ks(z(1)-z(3))+Cs(z(2)-z(4))-Kt(z(3)-R)];
And in another .m file
z0=[0,0,0,0];
[t,z]=ode113(qcar,[0:0.2:10],f0);
plot(t,z);

[Madhavan Pillai]

Thannks,I made the corrections and I am getting the below error. Can you please check if you are able to execute this code. Error:"Subscript indices must either be real positive integers or logicals" @yp(2) =-1/M*[Ks(z(1)-z(3)+Cs(z(2)-z(4))];

[José-Luis]

It is much simpler for you to use the debugger and figure out that error on your own.

 dbstop if error

Run your code and then look at the offending variables whenever it crashes. The error should become obvious.

Learn to use the debugger, it will save you a lot of grief and time in the future.

Answer 1

[KSSV]

You made multiple mistakes in the function: I have rectified them check it.

z0=[0,0,0,0];
[t,z]=ode113(@qcar,[0:0.2:10],z0);
plot(t,z);

function yp=qcar(t,z)
M=1000;
m=100;
Cs=1000;
Ks=36000;
Kt=360000;
R=150;
yp=zeros(4,1);
yp(1)=z(2);
yp(2)=-1/M*[Ks*(z(1)-z(3))+Cs*(z(2)-z(4))];
yp(3)=z(4);
yp(4)=-1/m*[Ks*(z(1)-z(3))+Cs*(z(2)-z(4))-Kt*(z(3)-R)];

end

[Madhavan Pillai]

Thannks,I made the corrections and I am getting the below error. Can you please check if you are able to execute this code. Error:"Subscript indices must either be real positive integers or logicals" @yp(2) =-1/M*[Ks(z(1)-z(3)+Cs(z(2)-z(4))];

[KSSV]

That's what I have mentioned....you made few errors..I have gave you correct code above in the answer..The above given code will work.

The given line,

   @yp(2) =-1/M*[Ks(z(1)-z(3)+Cs(z(2)-z(4))];

In the above line, you are trying to access some elements of Ks...Z(1)-Z(3) will be zero and there is no zero index in matlab..moreover your Ks is a scalar. Please go through the above code...which I have given.

[Madhavan Pillai]

Thank You. And sorry for not checking the answer completly the first time. New to MATLAB... Thats why. Will be needing more help with complex problems in coming days. Once Again thank u so much for prompt response and saving my day.

[KSSV]

You are welcome....

Will be needing more help with complex problems in coming days I advice you to learn MATLAB which is very easy..instead of posting in the forum..use this forum for major issues when you get stuck.