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Kueblerd
Germany
1 Posts |
 Posted - 04/09/2013 : 11:57:04 AM
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Origin Ver. and Service Release (Select Help-->About Origin): OriginPro 9.0.0 SR1
Operating System:Win 7 Pro
Hello there,
Is it possible to change the iteration-Algorithm of in te NL-Curvefitting from Levenberg-Marquard to another one?
Thanks
Daniel |
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meili_yang
103 Posts |
Posted - 04/09/2013 : 6:01:40 PM
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Hi Daniel,
No, the algorithm in NL-Curvefitting is only Levenberg-Marquard. The orthogonal distance regression algorithm is used in Nonlinear Implicit Curve Fit.
Regards,
Meili
OriginLab |
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easwar
USA
1964 Posts |
Posted - 04/10/2013 : 09:51:25 AM
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Hi Daniel,
Are you having issues with convergence with your data/function? If yes, can you send your data and your fitting function (if it is user defined), so we can check?
Note that in the NLFit dialog, there is a button in the middle panel marked as "S". This button will perform Simplex approximation, so this is an alternative to Levenberg-Marquardt. Performing a few rounds of Simplex followed by LM may work, if convergence is an issue.
Easwar
OriginLab
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changing the iteration-algorithm