Fitting a Function with trainlm to find function parameters?

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gary_feesher
gary_feesher 2016-10-9
回答： Greg Heath 2016-10-17
I would like to fit a curve with the Levenberg-Marquardt (LM) Algorithm, and I was wondering if it is possible to use the trainlm algorithm?
For example, I would like to fit a set of data points to with:
f(x) = a*sin(x) + b*cos(x).
I would like to estimate a and b using the LM algorithm in Matlab. Is this possible simply with the trainlm algorithm?
I have found a variety of sources, like: Curve Fitting via Optimization, but I am unable to Open the Script to view the source code.

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回答（2 个）

Matt J
Matt J 2016-10-9
编辑：Matt J 2016-10-9
Why not just use the Levenberg-Marquardt option of LSQCURVEFIT? Also, I hope you know that your example, a linear estimation problem, is far too trivial to bother with Levenberg-Marquardt. You could do it analytically with MLDIVIDE.
Greg Heath
Greg Heath 2016-10-17
Think of a neural net as a mapping between I-dimensional "I"nputs and O-dimensional "O"utputs achieved by using N pairs of I-dimensional input examples and corresponding O-dimensional output target examples.
Your problem does not fit into that category.
Hope this helps.
Thank you for formally accepting my answer
Greg

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