s=polyfit(x,y,2);
t=0:1:100;
w=s(1)*t.^2+s(2)*t+s(3);
S=sum((x-mean(x)).^2);
A=sum((w-mean(x)).^2);
r2=1-A/S
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s=polyfit(x,y,2);
t=0:1:100;
w=s(1)*t.^2+s(2)*t+s(3);
S=sum((x-mean(x)).^2);
A=sum((w-mean(x)).^2);
r2=1-A/S
