code writing+fitting data with polynomial

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milad babaei
milad babaei 2011-8-4
HI,
would someone plz help me how can i use this written script to make a code,fitting my data?
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
my data definition :
BoverH=1:8;
phi=0:10:30;
mydata = [ 1 1.02 1.11 1.21 1.3 1.4 1.59 1.78; ...
1 1.11 1.35 1.62 1.95 2.33 3.34 4.77; ...
1.01 1.39 2.12 3.29 5.17 8.29 22 61; ...
1.13 2.5 6.36 17.5 50 150 1400 14800];
h=log(mydata);
y=phi;
x=BoverH;
z=h;
......................................................
and the link of polynomial fit function which i would like to use :
http://www.mathworks.com/matlabcentral/fileexchange/31636-2d-polynomial-fitting-with-svd

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Walter Roberson
Walter Roberson 2011-8-4
order = 3; %salt to taste
[X, Y] = ndgrid(BoverH, phi);
Z = h.';
coeffs = fit2dPolySVD(X(:), Y(:), Z(:), order);
You should double-check the X and Y pairs to be sure that I got the right matching order for Z(:)
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milad babaei
milad babaei 2011-8-4
for 3th orde we have 10 coeff. if i want to male the equation how could i arrange thoese coeff. * X AND Y??TO EVALUATE POLYNOMIAL

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