How to enter a sigmoidal equation for a curve fit with lsqfitting
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he tratado de ingresar esta ecuación sigmoidal para un ajunste de curva lsqcurvefit con esta ecuación
y=1/(1+exp(4a(b-X)+2))
fun=@(x,xdata)1./(1+exp(4.*x(1).*(x(2) - xdata)+2))
x=lsqcurvefit(fun,x0,xdata,ydata)
he podido leer los datos aunque no he podido hacer los ajustes, al parecer reconoce al exponecial pero no los ajuste con X(1) y x(2).
alquien me podra ayudar con este tema
3 Comments
Matt J
on 10 Dec 2023
You haven't provided the data we would need to run the code. Most likely, though, the problem is your x0 has been chosen randomly (and therefore, poorly).
Accepted Answer
Image Analyst
on 9 Dec 2023
See my attached demo where I fit data to the rate equation (a sigmoid type of formula).
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1564499/image.png)
Adapt as needed, like using a different sigmoid formula. If you have problems, write back and attach your data and m-file.
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