Fitting line to a curve
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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
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/972900/image.png)
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John D'Errico
le 21 Avr 2022
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.
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