derivation using command diff

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joo
joo 2012-11-28
if x is position and t time
velocity=diff(x)./(diff(t)
acceleration=diff(x,2)./diff(t,2) or diff(x,2)./diff(t)
?
can anyone confirm?

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回答（1 个）

John Petersen
John Petersen 2012-11-28
velocity = diff(x);
acceleration = diff(velocity);
You can verify it yourself with an example such as x=cos(t), v=sin(t), a=-cos(t)

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