Hi, It says in R-intro.pdf, "For portable R code (including that to be used in R packages) only A–Za–z0–9 should be used." I'm an wondering why '_' and '.' can be used in portable R code.
It very common that some variable name should be composed of two or more English words. Can somebody let me know what is the widely accepted practice to concatenate two English words into a variable name? For example, shall I use "word1_word2" or "Word1Word2" or "word1.word2"? Regards, Peng ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
