is.R {base} | R Documentation |
Test if running under R.
is.R()
The function has been written such as to correctly run in all versions
of R, S and S-PLUS.
In order for code to be runnable in both R and S dialects previous to
S-PLUS 8.0, your code must either define is.R
or use it as
if (exists("is.R") && is.function(is.R) && is.R()) {
## R-specific code
} else {
## S-version of code
}
is.R
returns TRUE
if we are using R and FALSE
otherwise.
x <- runif(20); small <- x < 0.4 ## In the early years of R, 'which()' only existed in R: if(is.R()) which(small) else seq(along=small)[small]