how to find curve fit for my plot?

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Raheema Al Karim Damani
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.
  2 个评论
KSSV
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
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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回答（1 个）

Monisha Nalluru
Monisha Nalluru 2020-3-4
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
  1 个评论
Raheema Al Karim Damani
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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