Re: [R] ggplot2 argument handling odd

From: hadley wickham <>
Date: Thu, 27 Mar 2008 07:57:35 -0500

> Ok, I will try that, thanks. BTW, where is this aes_string option
> documented, sounds useful? How could I do the same thing with facetting?
> If I want to save something like ". ~ groupVar" as a string in a
> variable, could I pass it with facet_string to ggplot?

It's a see also from ?aes (or at least it is in the development version). facet_grid should already accept a string instead of a function, so it should just work.

> But anyway, I would be curious how to do it with qplot. The basic
> question is: How to pass the string of a variable to a function which is
> supposed to interpret it. Aka:
> var <- "magicVar"
> fun(doSomeMagic(var))
> doSomeMagic should then write magicVar at the place.

In general, you can use, substitute and eval:

x <-"mpg")
y <-"wt")

eval(substitute(qplot(x, y, data=mtcars), list(x=x, y=y)))



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Received on Thu 27 Mar 2008 - 16:51:21 GMT

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