Curve at the peak values

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Mepe 2019-3-16

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https://ww2.mathworks.cn/matlabcentral/answers/450444-curve-at-the-peak-values

评论： dpb 2019-3-17

For the evaluation of measurement results, a curve should be laid through the maximum values (polynomial or spline). Is there a direct possibility here or must the maximum measured values be read out separately?

Many thanks!

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dpb 2019-3-17

在 MATLAB Online 中打开

[OP's Answer moved to Comment...dpb]

Thanks, with

[pkt,lct] = findpeaks(ChannelE,Frequency,'Threshold',0.8);

this works quite well. What's the best way to create a fitting curve through the points? With polyfit or lsqcurvefit I was not very successful...

Many thanks!

dpb 2019-3-17

A smoothing spline would likely be the ticket there -- or a N peak mixed Gaussian or somesuch depending upon whether there is some sort of expected shape based on whatever it is the data represent and what the bounding curve is for--altho there's a dichotomy in that the two major peaks with the example "fit" are treated as one while the others with similar spacing are separated. The only difference appears to be the two are of essentially the same magnitude.

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