find peaks of excel graph

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saphir alexandre
saphir alexandre 2024-4-18
回答： Cris LaPierre 2024-4-18
Hello everyone,
I'm having some trouble with finding the peak coordinates of my excel data. The data has x and y values which i graphed, but i used findpeaks(data) and that did not work. I'm trying to have those peaks labeled as well if that is possible. Any help/suggestions are welcomes. Thank you
here is the graphs
here is what my code looks like
% graph
filename = 'HDPE-WAXS.xlsx';
which -all xlsread
DATA1 = readtable('HDPE-WAXS.xlsx');
%dintensity vs 2theta
intens = DATA1{:,2}; % intensity
twotheta = DATA1{:,4}; % 2theta
%plot of xrd hdpe
figure(1)
plot(twotheta,intens,'r')
xlabel('2theta (deg)')
ylabel('intensity (couts/sec)')
title('WAXS-XRD of HDPE')
  2 个评论
AH
AH 2024-4-18
You may want to try different options such as NPeaks, MinPeakHeight, ...
If you upload your data, we can provide you with a working syntax.
Voss
Voss 2024-4-18
"i used findpeaks(data) and that did not work"
Do you mean findpeaks(intens)? If that didn't work, you may need to adjust the parameters you specify in the findpeaks call:
https://www.mathworks.com/help/signal/ref/findpeaks.html#namevaluepairs
For more specific help/suggestions, please upload the xlsx file using the paperclip button.

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回答（1 个）

Cris LaPierre
Cris LaPierre 2024-4-18
I recommend using the Find Local Extrema live task in a live script. It is an interactive way to determine the appropriate settings for the detecting peaks in your specific data set.

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