Multiple piecewise linear fitting equation extraction

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Naser Khan on 4 Aug 2021

Commented: Naser Khanon 4 Aug 2021

Curve_fitting.JPG

Hello,

I am trying to obtain a linear curve fitting equation at every falling edge (or rising edge if fliped) of a long sorted (descending/ascending if fliped) power duration curve. From some research, piecewise linear fitting seems to be one solution, however, I couldn't find any tool in Matlab to get equations for severla chunks of a curve.

Is there an easier way to obtain these equation other than manully doing it using the curve fitting toolbox in the matlab?

PS: With reference to the attached image, whats needed is an equation for the curve between falling edges (chunks).

Thanks,

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Sulaymon Eshkabilov on 4 Aug 2021

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//www.tatmou.com/matlabcentral/answers/892397-multiple-piecewise-linear-fitting-equation-extraction#answer_760917

Yes, it is viable. There are a few discussions in MATLAB community how to do such regressions. Here is one of them: //www.tatmou.com/matlabcentral/answers/264701-piecewise-non-linear-curve-fitting-for-a-specific-type-of-data

And here is a code in published in MATLAB Central on piecewise linear fit: //www.tatmou.com/matlabcentral/fileexchange/40913-piecewise-linear-least-square-fit

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Naser Khan on 4 Aug 2021

thanks for the message, I have managed to fit the curve well. However, this tool still doesnt provide function after every falling edge.

Many thanks

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