[R] Generic 'diff'

Gabor Grothendieck ggrothendieck at gmail.com
Mon May 18 23:05:55 CEST 2009

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:


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]]
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