[R] transportable code?

[Spencer Graves]

As an extension of the recent discussion of "functions different in R and S", what suggestions do people have for writing transportable code for R/S beyond Venables and Ripley (2000, S Programming, pp. 202-203)?

For example, I recently found myself using the following construct:

if(version$major < 5){
# Function oldClass was introduced with the "new S"
# and is not present in R or S-Plus 2000
oldClass <- class
}

Similarly, I plan to define a function "gsub" if(is.null(version$language)).

Do these seem reasonable? Are there other suggestions / standard / compilations of thoughts?

Thanks,
Spencer Graves

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