How to label your peaks in descending order?

Question

John Mark Enhaynes 2021-3-30

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/787689-how-to-label-your-peaks-in-descending-order

编辑： LO 2021-3-30

采纳的回答： LO

在 MATLAB Online 中打开

I search the whole community and website on how to label my peaks from 1-5 from the highest value given

Here is my code I've made so far:

fid=fopen('Programming 2 Data.txt');
e=textscan(fid,'%f %f','headerlines',1);
f=cell2mat(e);
x = f(:,1);
y = f(:,2);
[sortedX,sortIndex]=sort(x);
sortedY=y(sortIndex);
plot(x,y)
findpeaks(sortedY,sortedX,'MinPeakHeight',290,'Annotate','Extents');
    xlabel('cm^-1')
    ylabel('%T')
    title('FTIR')
    axis tight
    grid
set(gca,'xdir','reverse')

I have search the terminology on findpeaks, but it doesn't really help me that much to get the desired result that I wanted.

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John Mark Enhaynes 2021-3-30

I've tried that, but I've got similar errors from other users I've seen in the forum

Mathieu NOE 2021-3-30

I ve plenty of other similar functions (attached)

try with peakseek and do the sorting by yourself afterwards

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Answer 1

LO 2021-3-30

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/787689-how-to-label-your-peaks-in-descending-order#answer_662424

编辑：LO 2021-3-30

在 MATLAB Online 中打开

something like this ?

my guess is that you won't need the sortedX because you are looking for peaks on your Y axis, right ? But try adapting this to your code. Eventually the "locs" variable will have to be modified taking into account your X vector.

[peaks,locs,widths] = findpeaks(sortedY,'MinPeakHeight',290,'Annotate','Extents');
[vals,order] = sortrows(peaks,'descend'); % sort them based on peak value, for instance, but you can sort them based on widths as well (just replace peaks with widths in sortrows)
scatter(locs(order),peaks(order),'rv');