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non linear curve fitting for scatter points
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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.
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Image Analyst
am 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().
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/175214/image.jpeg)
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Image Analyst
am 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.
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