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
You can use 'get':
for (i in 1:18){
.temp <- get(paste('b', i, sep='')) # get data to use
..... now use .temp in rest of calculations
}
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?
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?
I think that if you want to apply a simple calculation to each element something like df[,3:7] <- df[,3:7] + 10 would do what you want. --- 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. >