Generic 'diff'
You can define a new class for the object diff operates on and then define your own diff method for that. For some examples see: methods(diff)
On Mon, May 18, 2009 at 4:24 PM, Stavros Macrakis <macrakis at alum.mit.edu> wrote:
I would like to apply a function 'f' to the lagged version of a vector and the vector itself. This is easy to do explicitly: ? ? ?mapply( f, v[-1], v[-length(v)] ) or in the case of a pointwise vector function, simply ? ? ?f( v[-1], v[-length(v)] ) This is essentially the same as 'diff' but with an arbitrary function, not '-'. Is there a standard way to do this? Is there any particular reason that 'diff' should not have an 'f' argument? ? ? ? ? ? ?-s ? ? ? ?[[alternative HTML version deleted]]
______________________________________________ R-help at 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.