On Tue, Jan 13, 2009 at 10:23 AM, jim holtman <jholtman@gmail.com> wrote:

> How about this:
>
> > data(ToothGrowth)
> > ls()
> [1] "ToothGrowth"
> > data <- function(x){invisible(NULL)}
> > data(ToothGrowth)
> > ls()
> [1] "data"
> >
>
Yep, that sure does cause a problem alright. Is it the case that that
problems arise when you name a function with the same name as an existing
function? Or are there cases where naming data.frames, vectors, matrices,
etc. can also cause problems?

I hope I'm not being annoying -- I'm just trying to determine if I need to
break my habit of naming data.frames "data".

Thanks,
Ista


>
>
> On Tue, Jan 13, 2009 at 9:53 AM, Ista Zahn <istazahn@gmail.com> wrote:
> > From: baptiste auguie <ba208@exeter.ac.uk>
> > To: Dimitris Rizopoulos <d.rizopoulos@erasmusmc.nl>
> > Date: Tue, 13 Jan 2009 09:38:09 +0000
> > Subject: Re: [R] indexing question
> >
> >> you can also look at subset,
> >>
> >>
> >>        my.data.frame <- data.frame(a=rnorm(10),
> >>> b=factor(sample(letters[1:4], 10, replace=T)))
> >>>        str(my.data.frame)
> >>>        my.data.frame[my.data.frame$b == "a", ]
> >>>        subset(my.data.frame, b == "a")
> >>>
> >>
> >> by the way, it is probably safer not to use "data" as a variable name as
> it
> >> is also a function.
> >>
> >
> > I've often wondered about this. The thing is, I've never run into a
> problem
> > with this. For example:
> >
> >> ls()
> > character(0)
> >> data(ToothGrowth)
> >> ls()
> > [1] "ToothGrowth"
> >> rm(ToothGrowth)
> >> ls()
> > character(0)
> >> data <- data.frame(1:10, 101:110)
> >> data(ToothGrowth) #works just the same
> >> ls()
> > [1] "data"        "ToothGrowth"
> >>
> >
> > In this example the data command works just the same the second time,
> even
> > though I have a data.frame named data. Can someone give an example where
> > this causes a problem?
> >
> > Thanks,
> > Ista
> >
> >        [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help@r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
> >
>
>
>
> --
> Jim Holtman
> Cincinnati, OH
> +1 513 646 9390
>
> What is the problem that you are trying to solve?
>

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