程序改为：clc;clear;clf;x1=[5.23,4.39,3.69,3.12,2.68,2.34,2.09,1.92,1.81];f1=linspace(250,2250,9);p1=polyfit(x1,f1,3);symsxfy=vpa(poly2sym(p1,x),4)%显示拟合方程x2=0:0.01:6;f2=polyval(p1,x2);hold on;plot(x1,f1,'*',x2,f2);grid on结果fy = - 72.16*x^3 + 905.6*x^2 - 4051....
|
