I assume you are refering to MATLAB Grader. Certain commands and functions are not allowed when running code in MATLAB Grader, including run. However, the aim was likley to prevent use of the run function, which would allow users to circumvent restrictions an instructor places on solving a problem.
Ok, that's the why. In your case, you are not using the (very overlaoded) run function. Instead, you are calling an object function of MultiStart. That provides the workaround you need to use MultiStart in Grader. There are two ways to invoke a method (a.k.a. object function), which you can read about here.
- obj.methodName(arg)
- methodName(obj,arg)
Use the first syntax with dot notation, and the code will run in Grader
kol101=@(x)x.^2+2*sin(x.^2)+exp(-x);
opts = optimoptions(@fmincon,'Algorithm','sqp');
problem = createOptimProblem('fmincon','objective',...
kol101,'x0',3,'lb',1.2,'ub',4.8,'options',opts);
ms = MultiStart;
[xmin,fmin,flaga] = ms.run(problem,20)
fplot(kol101,[1.2,4.8])
hold on
plot(xmin,fmin,'rp')
