:ɢһ׵

ʽ:
DataDiff(a,h)
DataDiff(a)

a:洢
h:ÿݲֵ,ֵ0,ĬΪ1.

ԭ:
ʹ¹ʽ
Type = 1  : f1(y[2]-y[0])/(2h)

Type = 2  : f0(-25*y[0]+48*y[1]-36*y[2]+16*y[3]-3*y[4])/(12*h)

Type = 3  : f0(25*y[0]-48*y[-1]+36*y[-2]-16*y[-3]+3*y[-4])/(12*h)

Type = 4  : f0(-3*y[-1]-10*y[0]+18*y[1]-6*y[2]+y[3])/(12*h)

Type = 5  : f0(3*y[1]+10*y[0]-18*y[-1]+6*y[-2]-y[-3])/(12*h)

Type = 6  : f0(y[-2]-8*y[-1]+8*y[1]-y[2])/(12*h)

Type = 7  : f0(-3*y[0]+4*y[1]-y[2])/(2*h)

Type = 8  : f0(3*y[0]-4*y[-1]+y[-2])/(2*h)

:

x=0:0.1:10;a=sin(x);//һҺĲa,вΪ0.1,aݵһ׵

b=DataDiff(a,0.1);//ִбسԵõӦ,bݺcos(x)ݽжԱ