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I've just been trying unsuccessfully to fit a polynomial to a large set of data in Matlab (1301 points). I want to fit a polynomial to the data so that I have a function with which to try and manipulate the data in different ways.

I have no problem fitting polynomials to much smaller sets of data. I know that other curve fitting options exist, such as the moving average. However, it is my understanding that they do not return a function which can be used (so it seems it is just for presentation).

Has anyone had any experience with this?

Thanks,

Harry