:ֵһ׵

ʽ:
InterpolationDiff(x,y,h,w)
InterpolationDiff(x,y,h)
InterpolationDiff(x,y)

x:洢ĵ
y:xͬάľ
h:ʱ,ĬΪ0.2
w:ʱֵռ,ĬΪ0.8

˵:
1x㴦Ӧĵֵ,Էصľxάһ

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
5x(i)˷ֱΪhбʣȨؼȨwɵõһ׵

:
x=0:0.2:3;y=sin(x);dy=InterpolationDiff(x,y)