How could I put FIT parameters' errors in a variable?

2013 5 28
2 个回答
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更新时间：2022 5 28
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0 个投票

Hi, i know that I could do:
fuz=fittype('(a*x)/(1+b*(x^2))');
d=fit((final(:,8)),(final(:,6)),fuz,'StartPoint',[r1,s1]);
coeffi=coeffnames(fuz);
coefvv=coeffvalues(d);
g=coefvv'
and in g(1) there's the value of a and in g(2) the value of b.
But if I do:
fuz=fittype('(a*x)/(1+b*(x^2))');
[val1,val2,val3]=fit((final(:,8)),(final(:,6)),fuz,'StartPoint',[r1,s1]);
disp(val1);
I have also the error bars on the parameters...How could I put them into variables?

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Gabriele
Gabriele 2013-5-29

0 个投票

if I do disp(val1) I display in the command window:
General model:
val1(x) = (a*x)/(1+b*(x^2))
Coefficients (with 95% confidence bounds):
a = 0.0002983 (-0.0002809, 0.0008774)
b = 1.93e-009 (-3.784e-008, 4.17e-008)
how can I put the two numbers in (-3,784e-008, 4.17e-008) in a variable?

更多回答（1 个）

Gabriele
Gabriele 2013-5-31

1 个投票

the solution is reported here http://www.mathworks.it/it/help/curvefit/confint.html I hope it would be useful for anyone in the future...

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