defining a fitting type
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I have written a funcion called Even_fit.m and there are 5 coefficients that need to be found from the fit (a,b,c,d,f) and there is one variable N that I want to load from the workspace, which is already fixed before fitting. My question is how I can load this variable in the fit, since when I do:
ft_even = fittype("Even_fit(x,a,b,c,d,f,N)");
It will also take N as a fitting coefficient, which I do not want.
Thank you!
采纳的回答
My guess is
fitType = @(x,a,b,c,d,f)Even_fit(x,a,b,c,d,f,N);
fit(x,y,fitType)
2 个评论
Wout Laeremans
2023-1-16
Put the vector of the independent variable to the end of the input list for your function "EvenFit":
x = linspace(0,1,10).';
y = 3*x.^2 + 0.1*rand(10,1);
n = 12;
fitType = @(a,b,c,x)Even_fit(x,a,b,c,n);
sol = fit(x,y,fitType)
plot(sol,x,y)
function yfit = Even_fit(x,a,b,c,n)
yfit = a*x.^2+b*x+c;
end
更多回答（1 个）
Steven Lord
2023-1-12
0 个投票
See the "Create Custom Nonlinear Models and Specify Problem Parameters and Independent Variables" and "Use Anonymous Functions to Work with Problem Parameters and Workspace Variables" examples on the fittype documentation page.
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