:ɢһ׵

ʽ:
DataDiff2(t,y)

t:洢Ա
y:洢

˵:tжӦΪy,tʱʱyһ׵.tΪߵݼ,һ׵Ϊtʱ̶Ӧһ׵ֵ,ִгɹؾСtһ.

:

t=0:0.01:1.5;y=sin(t);
dy=DataDiff2(t,y)//سɵõ