How can I find the coefficient of my function by using regression in matlab?
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Parham Babakhani Dehkordi
on 23 Mar 2015
Commented: John D'Errico
on 23 Mar 2015
Hi, I really in trouble to find the coefficients of my function as follows: f=A+B(h/D)^n;
f=[6.67836E-05 3.6796E-05 2.30952E-05 1.51082E-05 1.05262E-05 7.56192E-06 5.54116E-06 3.096E-06]; h/D=[0.7696 0.8079 0.8327 0.8523 0.8669 0.8790 0.8892 0.9060];
I need to find the values of coefficients A, B and n by regression, however, I would not be able to do that. any help would be appreciated. Thanks in advance
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John D'Errico
on 23 Mar 2015
Edited: John D'Errico
on 23 Mar 2015
Easy enough.
f=[6.67836E-05 3.6796E-05 2.30952E-05 1.51082E-05 1.05262E-05 7.56192E-06 5.54116E-06 3.096E-06];
hd=[0.7696 0.8079 0.8327 0.8523 0.8669 0.8790 0.8892 0.9060];
funs = {1,@(c,x) x.^c};
[INLP,ILP] = fminspleas(funs,-2,hd,f)
INLP =
-10.064
ILP =
-1.3159e-05
5.7457e-06
n = INLP;
A = ILP(1);
B = ILP(2);
The curve fitting toolbox would do it quite simply too.
2 Comments
John D'Errico
on 23 Mar 2015
I'm quite confident that I told you that you need to download it from the file exchange. Given that I'm looking at my response now as I type this, I can be seriously confident of that fact. In fact, I even gave you a link to do that.
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