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How to limit data from a fit?

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Alexandria Will-Cole
回答： Walter Roberson 2018-7-24
I have a custom fit that fits data that I've plotted. I now want to try to limit the range in which the fit occurs. I want it to limit where x is less than 150.
Here is my current code:
rho=Resistivityohmcm;
T=TemperatureK;
plot(T,rho,'-o')
x=T;
y=rho;
fnPolySq=@(p1,p2,x) p1*x.^2 + p2;
fit(x,y,fnPolySq)
plot(f,T,rho)
disp (f)

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采纳的回答

Walter Roberson
Walter Roberson 2018-7-24
mask = x < 150;
f = fit(x(mask), y(mask), fnPolySq);
plot(f, T, rho)

更多回答（1 个）

Aquatris
Aquatris 2018-7-24
Create new variables;
range = find(x<150);
xNew = x(range)
yNew = y(range)
Obtain your fit using xNew and yNew variables instead of x and y.

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