Centre X-Y data so that the highest value of Ys is at the centre of X. And then average the curve to fit into gaussian.
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Hello, I have X-Y data of a curves (one coloumn for X and 4 columns for Y). I want to centre the Y data so that the highest value of Y gets to the centre of X. Right now the curves are haphazurd and I ant to make to symmetrical. I also want to fit the average of the curves into a gaussian profile.
Any help is greatly appreciated.
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Matt J
am 11 Nov. 2022
Bearbeitet: Matt J
am 11 Nov. 2022
Using gaussfitn from this FEX download,
you can do a simultaneous fit of all the columns:
[X,Y{1:4}]=readvars('X-Y.xlsx'); Y=cell2mat(Y); Y=Y(:);
t0=fminsearch( @(t)objfunc(t,X,Y) ,zeros(1,4) );
[~,dX,p]=objfunc(t0,X,Y);
f=@(x) p{1} + p{2}*exp( -0.5 * (x-p{3}).^2/p{4} ); %fitted Gaussian
[dX,is]=sort(dX);
Y=Y(is);
plot(dX,Y,'x',dX,f(dX)); shg
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1189088/image.png)
function [fval,dX,params]=objfunc(t,X,Y)
dX=X-t(:).'; dX=dX(:);
[params,fval]=gaussfitn(dX,Y,[],[],[],'Display','off');
end
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