non linear curve fitting for scatter points

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fereshte
fereshte on 8 Jul 2014
Commented: fereshte on 9 Jul 2014
hi...i have some scatter points in x-y coordinate.how can do curve fitting for them? please help me.its very necessary for me.

Answers (1)

Image Analyst
Image Analyst on 8 Jul 2014
When you say "non-linear" do you really mean nonlinear in x? Or do you mean just a regular polynomial, which can be, say a cubic, which can be solved with regular linear least squares like polyfit() gives you? You can have a fit that's not a straight line and it's still linear least squares because it's linear in the coefficients, not the x terms. I attach a demo for you that uses polyfit().
  3 Comments
Image Analyst
Image Analyst on 9 Jul 2014
I'm not familiar with finding mixtures of Gaussians. See Wikipedia article http://en.wikipedia.org/wiki/Mixture_density to get started.
fereshte
fereshte on 9 Jul 2014
thanks.dear Image Analyst how use cubic fit for my points?

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