[R] as.integer(TRUE)

Peter Dalgaard p.dalgaard at biostat.ku.dk
Tue Sep 14 08:34:13 CEST 2004

Tamas K Papp <tpapp at princeton.edu> writes:

> The fact that as.integer(TRUE) is 1 (and that for FALSE, it gives
> zero) is a really nice feature, eg when constructing piecewise
> functions (for example, as in -x*(x<0)+x*(x>=0)) and for many other
> things.
> Since I haven't found a reference about this, I just wanted to ask
> whether this is officialy part of the language or just a side effect
> (ie I want to know whether it is here to stay and if it is prudent to
> use this).

I can't find it in the official docs either, but I'm pretty sure that
it is blue book material, and that noone intends to change it.

   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907

More information about the R-help mailing list