Lsqnonlin failure optimization Global Local

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DIMITRY 2016-3-16

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https://ww2.mathworks.cn/matlabcentral/answers/273793-lsqnonlin-failure-optimization-global-local

回答： Alan Weiss 2016-3-16

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,