[R] errors when trying to rename data frame columns

[Uwe Ligges]

bogdan romocea wrote:

> Dear R users,
> 
> I need to rename the columns of a series of data frames. The names of
> the data frames and those of the columns need to be pulled from some
> vectors. I tried a couple of things but only got errors. What am I
> missing?
> 
> #---create data frame
> dframes <- c("a","b","c")
> assign(dframes[2],data.frame(11:20,21:30))
> 
> #---rename the columns
> cols <- c("one","two")
> 
> 
>>names(get(dframes[2])) <- cols
> 
> Error: couldn't find function "get<-"

It tells you that there is not function "get<-": you cannot assign into 
something you are calling with get()!


>>assign(dframes[2],data.frame(cols[1]=11:20,cols[2]=21:30))
> 
> Error: syntax error

Note the "[1]" in the name!



>>labels(get(dframes[2]))[[2]] <- cols

Same as above.


What you are really going to do is:


   dframes <- c("a","b","c")
   cols <- c("one","two")
   df <- data.frame(11:20, 21:30)
   names(df) <- cols
   assign(dframes[2], df)


Uwe Ligges


> Error: couldn't find function "labels<-"
> 
> I'm using R 2.0.0 on Windows XP.
> 
> Thank you,
> b.
> 
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