MATLAB: Multistart parameter space and fval return

Question

Hi everyone,

In the link below, please see section under Multistart -> Create GlobalOptimSolution Object.

http://www.mathworks.com/help/gads/how-globalsearch-and-multistart-work.html?refresh=true

It says that after Multistart reaches a stopping condition, it "creates a vector of GlobalOptimSolution". I am using multistart using the below syntax to solve a lsqnonlin problem to fit 6 parameters.

[x fval] = run(ms,problem,k)

But after multistart finishes going through all of the 'k' points, it returns just one value , the minimum value of fval that that found from 'k' different initial points and does not return a vector called 'GlobalOptimSolution' where all the values of fval are stored.

My questions are:

a)How can I get multistart to return a vector of all fvals as described in the section in the link above.

b) Is there a way I can see the kind of initial values matlab uses for the 'k' points ? I know that there are ways to give random OR custom start points but is there a way to know the initial values being used if I just specify 'k', i.e. number of initial points within given bounds to be sampled. Does MATLAB use some special code to generate 'k' values so that I can know that it is sampling the entire parameter space.

Thank you

Answer 1

The solution vector you are looking for is the 5th output returned by run(), but you are only saving the first 2 outputs.