On 7/25/2005 11:22 AM, [EMAIL PROTECTED] 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? > thanks a lot!
Just write a function that does that, e.g. f <- function(x) (x + 2) %% 4 - 2 The %% is the mod operator, so (x + 2) %% 4 adds 2 then maps all values into the range 0 to 4. You'll need a different formula for a different periodic function. Use plot(f, from=-7, to=7) to see that this works. Duncan Murdoch ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
