What is the most useful R trick?

Posted by Dirk Eddelbuettel on Stack Overflow See other posts from Stack Overflow or by Dirk Eddelbuettel
Published on 2009-08-18T19:26:27Z Indexed on 2010/06/05 20:52 UTC
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In order to share some more tips and tricks for R, what is you single-most useful feature or trick? Clever vectorization? Data input/output? Visualization and graphics? Statistical analysis? Special functions? The interactive environment itself?

One item per post, and we will see if we get a winner by means of votes.

[Edit 25-Aug 2008]: So after one week, it seems that the simple str() won the poll. As I like to recommend that one myself, it is an easy answer to accept.

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