Findpeaks with multiple columns

Question

HC98 2022-2-14

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1649315-findpeaks-with-multiple-columns

回答： Star Strider 2022-2-16

So I have an array which is sized at 2000 x 100, called bdata. I want to use findpeaks to determine the peaks in every column of this array. I tried the following:

for g = 2:size(bdata,2)
    [pk,loc] = findpeaks(bdata(:,g));
    P{g} = [pk loc];
end 

But it keeps calculating wrong values and even values not in bdata...

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Mathieu NOE 2022-2-14

hello

can you share the data as well and explain what you expect ?

Mathieu NOE 2022-2-16

hello

so , problem solved ?

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Answer 1

Star Strider 2022-2-16

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https://ww2.mathworks.cn/matlabcentral/answers/1649315-findpeaks-with-multiple-columns#answer_897540

I am not certain what the data are, and without the data an appropriate solution is not possible.

However, there are two observations:

1. The findpeaks call in the question will return the indices of the peaks, not the independent variable value corresponding to those peaks. Finding that however is straightforward — simply use the ‘locs’ result to index into it.

2. The easiest way to be certain that findpeaks returns the desired peak is to use one or more of the name-value pair arguments. The one I use most is 'MinPeakProminence' since it invariably works and is relatively independent of the actual peak height. The 'MinPeakDistance' name-value pair can also help isolate the correct peak.