急急急急！求高手，如何用matlab进行曲线拟合，就是已知x轴和y轴的数值，拟合出一个公式。

Question

x=[46％ 59％ 68％ 72％ 76％ 81％];
y=[347.402286 349.455347 349.60027 349.6897 350.3570 351.204];
理论公式为y=1.08709038×﹙101300+981.732x)½

Answer 1

% 直线拟合

x = [.46 .59 .68 .72 .76 .81];
y = [347.402286 349.455347 349.60027 349.6897 350.3570 351.204];
p = polyfit(x,y,1);
xx = min(x):.01:max(x);
yy = polyval(p,xx);
plot(x,y,'bo',xx,yy,'r-');
legend('原始数据','拟合曲线',2);
s = ['y =' poly2str(p,'x')];
title(s);