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Steven White

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28 Oct 2008 LMFnlsq - Solution of nonlinear least squares Efficient and stable Levenberg-Marquard-Fletcher method for solving of nonlinear equations Author: Miroslav Balda

This is a great bit of code that does exactly what it says. I used it to replace lsqcurvefit as I no longer have the optimisation toolbox.

I would suggest that the author also considers using additional examples, as the ones given are very complicated to understand if you come from a very different field. However, after a little search I found this by the author, which I found much more useful:
http://mathforum.org/kb/message.jspa?messageID=6283753&tstart=0

It tells you how to use the function to fit a curve to some data. This should be easily modified for fitting other functions/data etc.

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