[R] Column name defined by function variable

[Ralf B]

 Sorry, its late and I am getting tired ;)

I modified based on your suggestion:

#combine data
add.col <- function(df, new.col, name) {
	n.row <- dim(df)[1]
	length(new.col) <- n.row
        names(new.col) <- name
	cbind(df, new.col)
}
data <- data.frame(stuff1=as.numeric(d2$points))
data <- add.col(data, as.numeric(d1$morepoints), "stuff2")

but the column in the data frame is still called 'new.col' and not 'stuff2'.

Any further ideas?

Best,
Ralf



On Thu, Jun 17, 2010 at 5:14 AM, Ivan Calandra
<ivan.calandra at uni-hamburg.de> wrote:
> Hi,
>
> I haven't check much of what you wrote, so just a blind guess. What about in
> the function's body before cbind():
> names(new.col) <- "more stuff"
> ?
>
> HTH,
> Ivan
>
> Le 6/17/2010 11:09, Ralf B a écrit :
>>
>> Hi all,
>>
>> probably a simple problem for you but I am stuck.
>>
>> This simple function adds columns (with differing length) to data frames:
>>
>> add.col<- function(df, new.col) {
>>        n.row<- dim(df)[1]
>>        length(new.col)<- n.row
>>        cbind(df, new.col)
>> }
>>
>> Now I would like to extend that method. A new parameter 'name' shouild
>> allow people to pass in a name for that new column. Is that possible
>> and how can this be achieved?
>>
>> Example:
>>
>> myData<- data.frame(c(1,2,3))
>> add.col(myData, c(5,6,7,8), 'more stuff')
>>
>> adds a new column named 'more stuff' to the dataframe myData.
>>
>>
>> Any ideas?
>>
>> Best,
>> Ralf
>>
>> ______________________________________________
>> 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.
>>
>>
>
> --
> Ivan CALANDRA
> PhD Student
> University of Hamburg
> Biozentrum Grindel und Zoologisches Museum
> Abt. Säugetiere
> Martin-Luther-King-Platz 3
> D-20146 Hamburg, GERMANY
> +49(0)40 42838 6231
> ivan.calandra at uni-hamburg.de
>
> **********
> http://www.for771.uni-bonn.de
> http://webapp5.rrz.uni-hamburg.de/mammals/eng/mitarbeiter.php
>
> ______________________________________________
> 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.
>