how do I fit a Raman spectrum that has multiple peaks using Gaussian bands?
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Salvatore Maida
am 27 Jun. 2023
Kommentiert: Mathieu NOE
am 6 Jul. 2023
Hi everyone, I need to rent experimental data divided into two separate columns x and y, with the app Curve fitting I can do it but I display little information, for example I would like to view all 7 bands of the fit and not just the sum, I also want to get a table that contains all the Fitted data.
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Hiro Yoshino
am 28 Jun. 2023
How about trying GMM?
This is a standard way to estimate multiple gaussian distribution over the data using EM method.
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Hiro Yoshino
am 28 Jun. 2023
@Salvatore Maida You may need to tweak the setting (params and etc...) to make it converge as you wish but this technique is for it.
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Salvatore Maida
am 28 Jun. 2023
6 Kommentare
Mathieu NOE
am 6 Jul. 2023
finally decided to give a try with peakfit
so with a limited amount of time we can get a fairly good result (thanks to the author of the submission ! )
if you give some good initial guess values (position and width) you get this output :
load('data.mat');
data = MD700;
ind = data(:,1)<850; % we don't want to use the data above x = 850
data = data(ind,:);
Np = 5; % number of peaks
trials = 10; % number of trials , keep the best one
IG = [160 20 350 300 450 100 500 80 600 200]; % initial guess : [position1 width1 position2 width2 ... ]
% nb the number of peaks Np must be coherent with the size of IG (twice as
% big)
peakfit(data,0,0,Np,1,0,trials,IG)
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