# Normalization of poly22 fitsurface

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laura bagnale on 23 Jun 2021
Hello everyone,
I hope someone could help me. I would like to find a way to normalize poly22.
I have a set of X,Y,Z points in space, and I used fs poly22 to fit them with a surface.
This is my code:
X = [0.1; 0.05; 0.5; 0.5; 0.05; 0.4];
Y = [2.8; 5.5; 5.5; 1.4; 1.4; 2];
Z = [0.9; 0.3; 0; 0.2; 0.6; 1];
%plotting data and fitsurface
plot3(X,Y,Z,'or');
fs=fit([X,Y],Z, 'poly22','Normalize','on');
plot(fs, [X,Y],Z)
Linear model Poly22:
fs1(x,y) = p00 + p10*x + p01*y + p20*x^2 + p11*x*y + p02*y^2
where x is normalized by mean 0.2933 and std 0.2741
and where y is normalized by mean 2.683 and std 1.946
Coefficients:
p00 = 1.076
p10 = -0.01815
p01 = 0.08533
p20 = -0.5503
p11 = -0.07016
p02 = -0.2431
I would like my surface to be contained in a cube of edges 0-1 in the three directions, is there a way to do it?
Thank you very much for your help!
Kind Regards,
Laura

R2021a

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