[datatable-help] ggplot2 and data.table

[Matthew Dowle]

I'm not a ggplot2 expert by any means but I thought tests 167 and 168
already tested compatibility. It needs to be called in the following
way, though :

DT <- data.table(a=1:10, b=1:10)
ggplot(DT,aes(x=a,y=b))+geom_line()

If you have ggplot2 loaded, then running test.data.table() should flash
up the ggplot2 plots.

Are these forms ok or am I missing something?

Matthew


On Sun, 2011-08-14 at 21:55 +0100, Timothée Carayol wrote:
> Ah sorry -- the definition of ggplotDT() should be, of course:
> 
> 
> ggplotDT <- function(...) {
>  ggplot(, aesDT(...))
> }
> 
> 
> (aes_now() was an artifact from Hadley Wickham's Stack Overflow tip)
> 
> 
> t
> 
> 
> 
> 2011/8/14 Timothée Carayol <timothee.carayol at gmail.com>
>         Hi,
>         
>         For some time I have been wishing that data.table and ggplot2
>         could play a bit nicer together.
>         For example, I would like this to work but it doesn't:
>         
>         > test <- data.table(a=1:10, b=1:10)
>         > test[, ggplot() + geom_line(aes(x=a, y=b))]
>         Error in eval(expr, envir, enclos) : object 'a' not found
>         
>         I spent a few dozen minutes trying to understand what was
>         going on (and stumbling upon this useful advice from Hadley
>         Wickham), and it turns out that it's very easy to fix (though
>         the fix is not very pretty).
>         Datatable-help, I present you with.. aesDT and ggplotDT.
>         
>         
>         aesDT <- function(...) {
>          aes <- structure(list(...),  class = "uneval")
>          rename_aes(aes)
>         }
>         
>         Using aesDT() instead of aes() whenever you are in a
>         data.table (or in a with()) will now work. That is pretty much
>         all you need, but I thought I'd go just one tiny step further
>         with ggplotDT():
>         
>         ggplotDT <- function(...) {
>          ggplot(, aes_now(...))
>         }
>         
>         which makes the following possible:
>         
>         test[, ggplotDT(x=a, y=b) + geom_line()]
>         
>         i.e. put the aesthetics directly as arguments, saving a few
>         keystrokes and a pair of brackets.
>         Tiny problem that I have yet to solve: you now have to
>         explicitly give the name of all the aesthetics; aes() is
>         sufficiently clever to guess them if they're in the right
>         order, but the logic does not seem to carry over
>         straightforwardly to aesDT().
>         
>         
>         I know I'll be using these, so I thought maybe other people
>         here might be interested.
>         
>         
>         Timothee
> 
> 
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