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 <macra...@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@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. > ______________________________________________ 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.
