how to find curve fit for my plot?

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Raheema Al Karim Damani 2020-2-18

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https://ww2.mathworks.cn/matlabcentral/answers/506070-how-to-find-curve-fit-for-my-plot

评论： Raheema Al Karim Damani 2020-3-13

I have this plot in which I have plotted signal intensity vs time, but my plot does not look how it is supposed to (fig 2) instead it looks like fig 1.

so what I want to do is to find a function by curve fitting the points that I have already and then plotting the remaining points in the function to complete the curve. Ive tried using the cftool in matlab but I did not have any luck finding a function that would fit to my data.

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KSSV 2020-2-18

What you are looking for is extrapolation....you cannot expect the same result as you have shown.

Raheema Al Karim Damani 2020-2-18

oh yes, can you advise me on what kind of function I could use with this plot, to gather the extrapolated points?

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Answer 1

Monisha Nalluru 2020-3-4

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In order to get the second plot, Pre-processing of data is required. The pre-processed data then can be applied with the functions from Curve Fitting Toolbox such as cfit,sfit etc. After getting the fitting use those co-efficient to get the new signal intensity.

Also refer the following links:

https://www.mathworks.com/help/curvefit/linear-and-nonlinear-regression.html

https://www.mathworks.com/help/curvefit/interpolation.html

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Raheema Al Karim Damani 2020-3-13

Thank you for your response. Can you elaborate what you mean by pre-processing the data? I tried using cfit but I was not able to find any function that would fit my graph.

I was trying to use the slmengine function but I did not have much luck with it. From this graph, I am trying to extract area under curve which is why I do not just simply want to plot arbitrary points to complete the curve.

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