Gaussian decomposition

I am a physics major student.Now I want to use two Gaussian functions to fit the original function(When given the x,y data)in matlab.And this is for the emission spectrum.So,which function should I use(or which way)?Thank you!

Answer 1

[Walter Roberson]

http://www.mathworks.com/help/toolbox/stats/bq_679x-24.html

[yunle wei]

sorry,maybe I haven't cleared myself.I want the opposite way,that is,one function splitted to two functions,thank you.

[Walter Roberson]

Those routines appear to do that. See for example the text

2. Fit a two-component Gaussian mixture distribution. Here, you know the correct number of components to use. In practice, with real data, this decision would require comparing models with different numbers of components.

options = statset('Display','final');

gm = gmdistribution.fit(X,2,'Options',options);

[yunle wei]

Thank you.Precisely,now here is a n-2 matrix'X',X(:,1)and X(:,2)represent x and y coordinate,respectively.NOw I want to plot two Gaussian functions that can fit the data metioned above,that is ,the two new functions add together can match the y well enough and I just want the plot of the two new functions.