[R] differentiating a numeric vector

[Gabor Grothendieck]

Check out ?splinefun


On Wed, Mar 5, 2008 at 3:18 PM, Levi Waldron <leviwaldron at gmail.com> wrote:
> What functions exist for differentiating a numeric vector (in my case
> spectral data)?  That is, experimental data without an analytical
> function.  ie,
>
> > x <- seq(1,10,0.1)
> > y=x^3+rnorm(length(x),sd=0.01)     #although the real function would be nothing simple like x^3...
> > derivy <- ....
>
> I know I could just use diff(y) but it would be nice to estimate
> derivatives at the endpoints, calculate higher-order derivatives, and
> maybe have some smoothing options ie by differentiating a spline or
> something like that.
>
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