Warning when runing fsolve

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Fan
Fan 2013-2-3
When I run fsolve, there's a warning:
Warning: Trust-region-dogleg algorithm of FSOLVE cannot handle non-square systems; using Levenberg-Marquardt algorithm instead.
> In fsolve at 303
Solver stopped prematurely.
fsolve stopped because it exceeded the function evaluation limit, options.MaxFunEvals = 1000 (the default value).
How can I fixed that? Thank you!

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采纳的回答

Shashank Prasanna
The Warning is acceptable. If you are running the code I gave you, you already know it is not a SQUARE system.
As with all iterative problems, you will have to play around with Tolerances to achieve the results you want. Relax the MaxFunEvals that Walter mentioned using OPTIMSET:
http://www.mathworks.com/help/optim/ug/optimset.html
I really really advise you read this since you are new to optimization in MATLAB:
http://www.mathworks.com/help/optim/ug/when-the-solver-fails.html
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Shashank Prasanna
Shashank Prasanna 2013-2-4
options=optimset('Algorithm','Levenberg-Marquardt');
please see the documentation on optimset
Fan
Fan 2013-2-5
Thank you very much!

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更多回答（1 个）

Walter Roberson
Walter Roberson 2013-2-3
Pass in an options structure that indicates the algorithm and MaxFunEvals that you want to use.
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Fan
Fan 2013-2-4
Thank you very much for your suggestion and sorry for the late reply.
But could you tell me how can I change the algorithm to Levenberg-Marquardt algorithm if I want to see the difference between them?

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