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. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
