[R] how to write a periodic function in R?

Prof Brian Ripley ripley at stats.ox.ac.uk
Mon Jul 25 17:51:23 CEST 2005

On Mon, 25 Jul 2005 lma5 at ncsu.edu wrote:

> My question is how to write a periodic function in R.
> for example if there is a function f(x) that
> f(x)=f(x+4), for -2<x<2, f(x)=x
> how to write it in R?

f((x+2)%%4 - 2)  is one way.

Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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