Question

MATLAB 中已知数据点来至函数1/(1+25*x^2),-1《X《1,根据生成的数据点进行多项式拟合,绘出拟合曲线?

Answer 1

x = -1:0.05:1;

y = 1./(1+25*x.^2);

p=polyfit(x,y,9);

s=vpa(poly2sym(p))

f = polyval(p,x);

plot( x,f,x,y,'o ')