[PD] derivative function

[Federico]

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is there an object to compute the derivative function of a signal?

don't know if derivative is the right term..
i mean:
f(x)=x      => f'(x)=1
f(x)=ln(x)  => f'(x)=1/x
f(x)=sin(x) => f'(x)=cos(x)
...

and a more question: has this anything to do with complex signals or
fourier?

thanks
- --
Federico
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