[R] merge a list of data frames

[Sam Steingold]

I have a list of data frames:

> str(data)
List of 4
 $ :'data.frame':	700773 obs. of  3 variables:
  ..$ V1: chr [1:700773] "200130446465779" "200070050127778" "200030633708779" "200010587002779" ...
  ..$ V2: int [1:700773] 0 0 0 0 0 0 0 0 0 0 ...
  ..$ V3: num [1:700773] 1 1 1 1 1 ...
 $ :'data.frame':	700773 obs. of  3 variables:
  ..$ V1: chr [1:700773] "200130446465779" "200070050127778" "200030633708779" "200010587002779" ...
  ..$ V2: int [1:700773] 0 0 0 0 0 0 0 0 0 0 ...
  ..$ V3: num [1:700773] 1 1 1 1 1 ...
 $ :'data.frame':	700773 obs. of  3 variables:
  ..$ V1: chr [1:700773] "200130446465779" "200070050127778" "200030633708779" "200010587002779" ...
  ..$ V2: int [1:700773] 0 0 0 0 0 0 0 0 0 0 ...
  ..$ V3: num [1:700773] 1 1 1 1 1 ...
 $ :'data.frame':	700773 obs. of  3 variables:
  ..$ V1: chr [1:700773] "200160325893778" "200130647544079" "200130446465779" "200120186959078" ...
  ..$ V2: int [1:700773] 0 0 0 0 0 0 0 0 0 0 ...
  ..$ V3: num [1:700773] 1 1 1 1 1 1 1 1 1 1 ...

I want to merge them.
I tried to follow
http://rwiki.sciviews.org/doku.php?id=tips%3adata-frames%3amerge
and did:

> data.1 <- Reduce(function(f1,f2) merge(f1,f2,by=c("V1"),all=TRUE), data)
Warning message:
In merge.data.frame(f1, f2, by = c("V1"), all = TRUE) :
  column names 'V2.x', 'V3.x', 'V2.y', 'V3.y' are duplicated in the result
> str(data.1)
'data.frame':	700773 obs. of  9 variables:
 $ V1  : chr  "100010000099079" "100010000254078" "100010000499078" "100010000541779" ...
 $ V2.x: int  0 0 0 0 0 0 0 0 0 0 ...
 $ V3.x: num  0.476 0.748 0.442 0.483 0.577 ...
 $ V2.y: int  0 0 0 0 0 0 0 0 0 0 ...
 $ V3.y: num  0.476 0.748 0.442 0.483 0.577 ...
 $ V2.x: int  0 0 0 0 0 0 0 0 0 0 ...
 $ V3.x: num  0.476 0.752 0.443 0.485 0.578 ...
 $ V2.y: int  0 0 0 0 0 0 0 0 0 0 ...
 $ V3.y: num  0.47 0.733 0.57 0.416 0.616 ...

I don't like the warning and I don't like that I now have to use [n] to
access identically named columns, but, I guess, this is better than
this:

library('reshape')

> data.1 <- merge_all(data,by="V1",all=TRUE)
Error in merge.data.frame(dfs[[1]], Recall(dfs[-1]), all = TRUE, sort = FALSE,  : 
  formal argument "all" matched by multiple actual arguments
> data.1 <- merge_all(data,by="V1",sort=TRUE,all=TRUE)
Error in merge.data.frame(dfs[[1]], Recall(dfs[-1]), all = TRUE, sort = FALSE,  : 
  formal argument "all" matched by multiple actual arguments
> data.1 <- merge_all(data,by="V1",sort=TRUE)
Error in merge.data.frame(dfs[[1]], Recall(dfs[-1]), all = TRUE, sort = FALSE,  : 
  formal argument "sort" matched by multiple actual arguments
> data.1 <- merge_all(data,by="V1")
Error in `[.data.frame`(df, , match(names(dfs[[1]]), names(df))) : 
  undefined columns selected
> data.1 <- merge_all(data,by=c("V1"))
Error in `[.data.frame`(df, , match(names(dfs[[1]]), names(df))) : 
  undefined columns selected

what does 'formal argument "sort" matched by multiple actual arguments' mean?

thanks.

-- 
Sam Steingold (http://sds.podval.org/) on Ubuntu 12.04 (precise) X 11.0.11103000
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