Thank you very much for your help, David!

Now I have got an object which I can work with.

You mentioned that I took two steps to create the new column names.
I had tried doing it in one step but couldn't find out how. Could you help
me with that, as well?

Thank you very much!

Marion


2012/2/14 David Winsemius <dwinsemius@comcast.net>

>
> On Feb 14, 2012, at 9:20 AM, Marion Wenty wrote:
>
>  Dear R-helpers,
>>
>> I created an own function which looks like this
>>
>> s_elternmz <- function(Var="balt")
>>
>
>     {
>>  Dg_a<-mz[,c("asbhh","apkz",**Var)]
>>  colnames(Dg_a)[colnames(Dg_a)=**="apkz"]<-"bpkzm"
>>  colnames(Dg_a)[colnames(Dg_a)=**=Var]<-paste(Var,"_m",sep="")
>>  mz_int<-merge(mz,Dg_a,by=c("**asbhh","bpkzm"),all.x=T)
>>  colnames(Dg_a)[colnames(Dg_a)=**="bpkzm"]<-"bpkzv"
>>
>> colnames(Dg_a)[colnames(Dg_a)=**=paste(Var,"_m",sep="")]<-**
>> paste(Var,"_v",sep="")
>>
>
> Why take two steps to change that column name?
>
>
>   mz_int<-merge(mz_int,Dg_a,by=**c("asbhh","bpkzv"),all.x=T)
>>
>
> You just overwrote an object that you created earklier but have not done
> anything with in the meantime.
>
>   mz_int <-
>> mz_int[order(mz_int$asbhh,mz_**int$apkz), c(colnames(mz),paste(Var,"_m",*
>> *sep=""), paste(Var,"_v",sep=""))]
>>
>> }
>>
>> My problem is that the objects are not saved in the workspace. Especially
>> I
>> need the object which I created in the end - mz_int - because I want to do
>> calculations with it in R afterwards.
>>
>
> Then just assign it:
>
> mz_result <- s_elternmz()
>
> As you have noticed, assignment inside a function is not a durable event.
> The function returns the value of either its first encounter with return()
> or the value
> of hte last assignment (but not the name to which that object was
> assigned.) Welcome to R's version of functional programming.
>
>
>> Thank you very much for your help in advance.
>>
>> Marion
>>
>>        [[alternative HTML version deleted]]
>>
>> ______________________________**________________
>> R-help@r-project.org mailing list
>> https://stat.ethz.ch/mailman/**listinfo/r-help<https://stat.ethz.ch/mailman/listinfo/r-help>
>> PLEASE do read the posting guide http://www.R-project.org/**
>> posting-guide.html <http://www.R-project.org/posting-guide.html>
>> and provide commented, minimal, self-contained, reproducible code.
>>
>
> David Winsemius, MD
> West Hartford, CT
>
>

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