Gaussian residual analysis data extraction? Subpeak plotting.

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Robert 2013-5-1

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https://ww2.mathworks.cn/matlabcentral/answers/74200-gaussian-residual-analysis-data-extraction-subpeak-plotting

Hi, I have some data that is made up of convoluted gaussian peaks (XPS C1s peak in fact) and I would like some help on plotting the subpeaks in an elegant manner and also extracting residual fit data and the fitted lineshape data.

My data is stored in X and Y data vectors.

I am applying a gaussian fit as follows (for 2 gaussian subpeaks):

fitdata = fit(x,y, 'gauss2' , fitoptions)

This gives me a decent envelope fit of the data.

I am then plotting the fit and residual fit in a subplot as follows:

plot(fitdata, x, y,'residuals')

My question is how can I get the data of the residual plot into X, Y form so I can perform further analysis (e.g. variance)? Simply I would do data-fitdata, however I cannot extract the X Y data of fitdata to do this.

So simply I suppose my question is how do I extract the X Y data from the results of the fit() function?

Also I am trying to plot the subpeaks of the gaussian fit. I am currently doing this by extracting the parameters contained in the datafit struct and applying them to gaussmf() to plot gaussian shapes, however it feels like there should be a more elegant way to do this. Is there?

Thanks in advance, Rob