I write PHP and some perl, and recently learned R. This guide would have been useful to me at the beginning. What it does well is that it jumps right into conce

I write PHP and some perl, and recently learned R. This guide would have been useful to me at the beginning. What it does well is that it jumps right into concepts that programmers will naturally wonder about and already conceptually grok. It wastes no time on explaining basic programming concepts, nor does it dig deep into esoteric R-isms. It helps you translate your PHP/Perl/Java/whatever mindset into the R language. An extremely useful introductory document.