I did try to use the interpolation technique, but could not reach a good solution. I would appreciate it if you take a look at the data and see how can I get what I want.

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Rik 2017-9-29

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https://ww2.mathworks.cn/matlabcentral/answers/358959-get-data-from-plot-at-specific-points-not-available-in-the-original-data#answer_283644

What you want is impossible without fitting a function to your data. This can be achieved in many ways, for example by fitting a quadratic curve to your data with polyfit.

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ayat 2017-9-29

编辑：ayat 2017-9-29

data.xls

Oh damn it. Well, actually the data I posted is a part of the 400 point data. I have attached the data here.

Rik 2017-9-29

My point still stands. You need to fit a function (or use a spline method) before you can interpolate data. That you have 400 points instead of 6 doesn't really matter (although it may improve the fit).

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