[R] the difference between temp and .temp

[Tim Calkins]

Hi everyone -

This came up within the last day -- Jim's response to Deepankar is pasted below.

There are probably lots of reasons, but what is the advantage to using
.temp over, say, temp?

I often find myself writing temporary objects -- should I use the .
preface?  What would be the advantages to doing so?

Thanks in advance for what will surely be a collection of illuminating
responses.

tim




On 10/25/07, jim holtman <jholtman at gmail.com> wrote:
> Actually I forgot you have a data frame. so use:
>
> for (i in 1:18){
>     .temp <- yourDataFrame[[paste('b', i, sep='')]]
>     ....   use .temp ....
> }
>
>
> On 10/24/07, DEEPANKAR BASU <basu.15 at osu.edu> wrote:
> > Hi All,
> >
> > I have a data frame with a group of variables named b1, b2, b3, ..., b18. These variables take the value 1, 2 or NA. For each observation, I want to do some computation by looping over the values for the group of variables: b1 to b18. In STATA I would do:
> >
> > forval i=1/18 {
> >  --- use b`i' for computation ----
> > }
> >
> > How can this be done in R?
> >
> > Deepankar
> >
> > ______________________________________________
> > R-help at 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 you are trying to solve?
>
> ______________________________________________
> R-help at 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.
>




-- 
Tim Calkins
0406 753 997