[Rd] Documentation bug (is.R). (PR#590)

[cate@neper.ethz.ch]

Full_Name: Giacomo Catenazzi
Version: 1.0.1
OS: Linux (Debian)
Submission from: (NULL) (129.132.9.24)


>From is.R documentation:

     `if (exists(is.R) && is.function(is.R) && is.R()) {'
     `    '## R-specific code
     `} else {'
     `    '## S-version of code
     `}'

It should be writen as '' exists("is.R") '' (is.R must be quoted).

> exists(is.R)
Error in exists(x, envir, mode, inherits) : 
	invalid first argument
> exists("is.R")
[1] TRUE


	giacomo

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