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Difference between a[[i]] and a[i]

David Epstein 
I'm sure I've read about the difference between a[[i]] and a[i] in R, but I
cannot recall what I read. Even more disturbing is the fact that I don't
know how to search the newsgroup for this. All the different combinations I
tried were declared not to be valid search syntax.

1. What sort of object can the operators [] and [[]] be applied to? How do
they differ? I mean objects in standard R, not in packages that provide
conceivable overloading of these operators (if that's possible).
2. Meta-question: how could one search for an answer to this question in the
newsgroup?
3. Meta-question: how could one search for an answer to this in the FAQ?
4. Meta-question: how could one search for an answer to this in any of the
links one is shown after typing help.start()?

Thanks for any help.
David

Thread (4 messages)

David Epstein Difference between a[[i]] and a[i] Feb 2 Duncan Murdoch Difference between a[[i]] and a[i] Feb 2 Rolf Turner Difference between a[[i]] and a[i] Feb 2 Wacek Kusnierczyk Difference between a[[i]] and a[i] Feb 3