Lsqnonlin failure optimization Global Local

Hi world,

I have the following error using lsqnonlin to fo an optimization. I am running 5 optim in a for loop to fit as close as my objective function. At one step the solver return the following error while the previous optimizations where fine. The last step before the error was pretty close to the expectation I would expect the solver to get out without error.

Failure to solve for root in analytic expression.

My objective function is as a square of a relative difference ie (x-m)./m)^2 the solver's options are as follow: options = optimset('disp','iter','MaxFunEvals',1000,'TolX',1e-8,'TolFun',1e-5,'Algorithm','trust-region-reflective','UseParallel','always');

Can I kindly ask you how to hand over this issue?

Regards,

Answer 1

[Alan Weiss]

It sounds like the error is coming from your objective function. Can you show us your objective, please?

Alan Weiss

MATLAB mathematical toolbox documentation