How to sum two gaussian curve fits (cfit) ?

Dear All,

I have two peaks fitted with gaussian profiles (cfit) as shwon in the image below. I need to sum these two gaussian curves together but arthimetic operations are not allowed on cfit types in MATLAB. The peaks with the black and blue asterisks represent Row1 & Row2. The red curves are the gaussian fits performed as:

F1=fit (x1', y1','gauss2');
F2=fit (x2', y2','gauss2');

The summation of the F1 and F1 is just not allowed as:

D = F1+F2;
Undefined operator '+' for input arguments of type 'cfit'.

and I am looking for a way to add them together. Any thoughts?

Answer 1

[Chris]

You could evaluate the fits and add them, though they would no longer be cfits.

x = linspace(20,35);
F1pts = feval(F1,x);
F2pts = feval(F2,x);
Fsum = F1pts+F2pts;

figure
plot(F1)
hold on
plot(F2)
plot(X,Fsum)

or more succinctly:

x = linspace(20,35);
plot(x, F1(x) + F2(x))

[Naif Alsalem]

Thank you very much, @Chris. Absolutely what I needed. The keyword was with the: feval.

Much obliged