Along the lines of Gabor's method, presumably you could put a "spare" argument in your function:

foo<- function(x,help=FALSE,...)
{
helpout<-c(comment,
comment,
end of comments)
if(something_is_wrong_with_inputs || help=TRUE)
        {
        print(helpout)
        stop #or trycatch, or whatever you prefer
        }
[remainder of function]
}

I know that's sloppy but I'm new to R.

Carl

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