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 commentaires
Matt J
le 10 Déc 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).
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Image Analyst
le 9 Déc 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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