Fitting line to a curve

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David Harra 2022-4-21

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编辑： Matt J 2022-4-22

I have a plot of attenuation V frequency and I am wondering if there is a way I can fit a straight line the follows the upper trajectory of the graph, so that you would see the line increase and then level off. I have tried a few methods but getting lines through the middle etc. Many Thanks

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David Harra 2022-4-21

Thanks I will keep this in mind for future. How do I include my data as a .mat file?

Dave :)

Matt J 2022-4-22

编辑：Matt J 2022-4-22

The toolbar has a a file attachment option.

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采纳的回答

John D'Errico 2022-4-21

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Easy.

Use findpeaks, to locate the sequence of points that represent the successive maxima of the curve.
Use an interpolating spline to then interpolate those points. A tool like interp1 will be simplest. Specify the 'pchip' option.