[R] Referencing variables in a dataframe.

Gabor Grothendieck ggrothendieck at gmail.com
Fri Apr 7 03:15:43 CEST 2006

Here are two ways:

with(iris, Sepal.Length + Sepal.Width)


On 4/6/06, Brian Quinif <bquinif at gmail.com> wrote:
> I have a question about how to reference variables in a dataframe.
> Normally, after I have read in some Stata data using the following command
> all <- read.dta('all.dta')
> Whenever I want to use the variable "sat.vr1" in the "all" data frame,
> I do so using
> all$sat.vr1
> However, I'd like to be able to use the sat.vr1 variable without the
> "all$" (as well as all of the other variables of the dataframe).
> Is there some way to make a particular dataframe the "active" or
> "default" one so that a can do this?
> Thanks,
> Brian
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