R help - Feb 2010 - performing the same commands on two different data sets

Hi All,


I would like to perform the same set of commands on the two different sets.
I would to avoid writing the same set of command twice so I was wondering if
there is an smart way to do this. I was thinking to use a loop as follows

Data<-read.table(file=?data.txt?, header=T, sep=?\t?)
D1<-Data[,1:30]
D2<-Data[,30:60]

ID<-c(?D1?,?D2?) 
for (i in 1:length(ID)){
data<-ID[i]

}

I can not assign D1 or D2 as data<-ID[i]? is there a way to do this?

Thanks


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Did you try  data<-ID[[i]]  instead of your data<-ID[i]?

Kjetil

On Tue, Feb 9, 2010 at 11:19 AM, kayj <kjaja27 at yahoo.com>
wrote:
>
> Hi All,
>
>
> I would like to perform the same set of commands on the two different sets.
> I would to avoid writing the same set of command twice so I was wondering
if
> there is an smart way to do this. I was thinking to use a loop as follows
>
> Data<-read.table(file=?data.txt?, header=T, sep=?\t?)
> D1<-Data[,1:30]
> D2<-Data[,30:60]
>
> ID<-c(?D1?,?D2?)
> for (i in 1:length(ID)){
> data<-ID[i]
>
> }
>
> I can not assign D1 or D2 as data<-ID[i]? is there a way to do this?
>
> Thanks
>
>
> --
> View this message in context:
http://n4.nabble.com/performing-the-same-commands-on-two-different-data-sets-tp1474452p1474452.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> 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.
>

You skipped a step: the get() function allows you to use the name
of an object to load the object itself.

ID<-c(?D1?,?D2?)

for (i in 1:length(ID)){
   data<- get(ID[i])
   do stuff with data
}

Alternatively you could write a function that takes the object
as its argument.

myFunction <- function(data) {
   do stuff with data
}

myFunction(D1)
myFunction(D2)

Naming your objects data and Data is a recipe for confusion, though.

Sarah

On Tue, Feb 9, 2010 at 9:19 AM, kayj <kjaja27 at yahoo.com>
wrote:
>
> Hi All,
>
>
> I would like to perform the same set of commands on the two different sets.
> I would to avoid writing the same set of command twice so I was wondering
if
> there is an smart way to do this. I was thinking to use a loop as follows
>
> Data<-read.table(file=?data.txt?, header=T, sep=?\t?)
> D1<-Data[,1:30]
> D2<-Data[,30:60]
>
> ID<-c(?D1?,?D2?)
> for (i in 1:length(ID)){
> data<-ID[i]
>
> }
>
> I can not assign D1 or D2 as data<-ID[i]? is there a way to do this?
>
> Thanks
>
>
> --
> View this message in context:
http://n4.nabble.com/performing-the-same-commands-on-two-different-data-sets-tp1474452p1474452.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> 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.
>


-- 
Sarah Goslee
http://www.stringpage.com
http://www.astronomicum.com
http://www.functionaldiversity.org

thank you all for your help, the get() function worked perfectly.

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