to remove the error in this line of code "[T,Y] = ode45(@(t,y) intgrl(t,y​,u),tspan,​yo,options​);"

i am trying to solve the optimization problem by using function but i am getting an error in it.

function f=bench_func(x)
[ps,d]=size(x);       
% The optimal control of a non-linear stirred tank reactor.       
          tol=1.0e-01;
          tspan=[0 0.78];
          yo =[0.09 0.09]';
          u=x; %u should be passed here.
          options = odeset('RelTol',tol);
          [T,Y] = ode45(@(t,y) intgrl(t,y,u),tspan,yo,options);
          f=sum(sum(Y.^2,2)+(0.1)*(u).*(u));

error

Error in bench_func (line 141)
          [T,Y] = ode45(@(t,y) intgrl(t,y,u),tspan,yo,options);

please help me to solve this error.

Answer 1

[Walter Roberson]

It appears that intgrl might be http://www.mathworks.com/matlabcentral/fileexchange/2268-projects-for-scientists-and-engineers/content/penland/intgrl.m from the File Exchange. Have you installed that package and added it to your MATLAB path?

We need the full error message that you received.

[Muhammad Umer]

thanks for your response. i have not installed this "intgrl" package. how can i install this package to run this code?

[Walter Roberson]

Go to the above link and on the upper right side of the page click on Download ZIP. Save that file and unzip the contents into a user directory. Then go into MATLAB and use pathtool to add that directory to the MATLAB path.