2nd derivative in discrete time domain

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cool.man

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2nd derivative

Hi,
Can anyone tell me the 2nd derivative of dx/dt in discrete time
1st derivative of the function dx/dt is [x(t)+x(t-1)]/T
Thanks
 

Re: 2nd derivative

d2x/dt2 = [x(t)-2x(t-1)+x(t-2)]/T^2

Regards,
Chris
 

Re: 2nd derivative

thanks cdh7 for your help.if you don't mind plz tell me the 3rd derivative.
 

Re: 2nd derivative

See the Wikipedia article "Finite Difference" for the general method of calculating higher order differences.

Regards,
Chris
 

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