:÷ֵֶ(һάֵ)

ʽ:
InterpolationPoly(x,y,x1)

x:洢֪ĵ
y:xͬάľ
x1:Ҫֵľ

˵:
1x1Ӧy1ֵ

ԭ:
1xyУÿһx(i)x(i+1)㷽 y=a+b*x+c*x^2+d*x^3,
2x(i)x(i+1)˵ֵ˵㴦һ׵δ֪ϵabcd
3ÿһx(i)x(i+1)һӦabcd
4һֵ

:
x=0:0.2:3;y=sin(x);x1=0:0.02:4;y1=InterpolationPoly(x,y);plot(x,y,x1,y1);//Իͼ鿴ֵЧ