MATLAB: To remove the error in this line of code “[T,Y] = ode45(@(t,y) intgrl(t,y​,u),tspan,​yo,options​);”

differential equationsoptimization

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.

Best Answer

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.
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