[R] ref card for data manipulation?

[Vitalie Spinu]

On Wed, 10 Dec 2008 18:29:43 +0100, Peter Dalgaard <P.Dalgaard at biostat.ku.dk> wrote:

>
> You (as many before you) have overlooked the ave() function, which can
> replace the ordering as well the do.call(c,tapply(....))
>

Majority of questions on this list concern data manipulation. Many are repetitive. "Overlooking" like that will always happen unless some comprehensive data manipulation documentation is made.
I think many people would benefit if  a specialized data.manip ref.card were conceived. 

Tom Short's card is an excellent one but it does not cover high level packages like plyr, reshape, DoBy, and a few base data.manip functions are not there as well.

Vitalie.