[R] differentiating a numeric vector

From: Levi Waldron <leviwaldron_at_gmail.com>
Date: Wed, 05 Mar 2008 15:18:28 -0500


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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