which gives you all results in one data.frame.

> Many ways. Here is one:

>

> ### supposing you have y1, y2, and y3 in your data frame

>

> for (i in 1:3) {

>

> yi <- paste('y',i,sep='')

>

> ti <- aggregate(dataframename[[yi]],

> by=data.frame(dataframename$aggregationvar),

> sum,na.rm=TRUE)

>

> assign( paste('ti',i,sep='') , ti, '.GlobalEnv')

> }

>

> Or if you happen to think using assign() is bad form you can store each ti

> in a list().

>

> -Don

>

>

> --

> Don MacQueen

>

> Lawrence Livermore National Laboratory

> 7000 East Ave., L-627

> Livermore, CA 94550

> 925-423-1062

>

>

>

>

>

> On 11/1/12 4:32 AM, "bchr" <

[hidden email]> wrote:

>

>> Hey everybody,

>>

>> I am looking for a way to loop commands over several variables in a

>> dataframe. Basically I want to do something like this:

>>

>> ti1<-aggregate(dataframename$y1,

>> by=data.frame(dataframename$aggregationvar),

>> sum,na.rm=TRUE)

>>

>> This works fine as it is but i want to do it for several variables thereby

>> generating several tix. I tried with a for-loop but the problem was that I

>> could neither find a way combine my indexnumber i (1 ... x) with the y or

>> ti

>> (as for example in Stata I could do by writing y`i') nor did it work

>> using

>> a vector of string variables ("y1", ... "yx") and looping over that

>> (while

>> using yx also as a name for the target dataframe instead of tix - i

>> would'nt

>> mind that).

>>

>> Preferably I would be looking for a solution that can do without any of

>> the

>> apply functions (yes, I know they are more R-like, but frankly, I don't

>> get

>> the logic behind them, so for the time being I would prefer another way)

>>

>> Tanks very much for your help

>>

>> Bernhard

>>

>>

>>

>> --

>> View this message in context:

>>

http://r.789695.n4.nabble.com/Loop-over-several-variables-tp4648112.html>> Sent from the R help mailing list archive at Nabble.com.

>>

>> ______________________________________________

>>

[hidden email] 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.

>

> ______________________________________________

>

[hidden email] 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.