[R] Merging list of dataframes with reshape merge_all
ruipbarradas at sapo.pt
Fri Jan 11 13:26:03 CET 2013
To "solve" the problem you can use all.x and all.y but I think there are
other problems with merge_all, in the example below it doesn't include
df2$Y in the result df.
df1 <- data.frame(col1=1:10, col2=11:20, col3=21:30, X = rnorm(10))
df2 <- data.frame(col1=1:10, col2=11:20, col3=21:30, Y = rnorm(10))
merge_all(list(df1, df2), by=c("col1","col2","col3"), all.x=TRUE,
all.y=TRUE) # No Y column
merge(df1, df2, by=c("col1","col2","col3"), all.x=TRUE, all.y=TRUE)
Contact the package maintainer for more info.
 "Hadley Wickham <h.wickham at gmail.com>"
Hope this helps,
Em 11-01-2013 10:08, Johannes Radinger escreveu:
> I'd like to merge mutliple dataframes from a list of dataframes by some common
> columns. The approach for simply merging 2 dataframes is working with:
> For mutliple dataframes in a list I try to use the merge_all command
> from the package reshape.
> The documentation states that the command takes a list of dataframes
> and other additional
> argument which are passed on to merge. So I tried (just for the case
> of two dataframes):
> but I get following error:
> Error in merge.data.frame(dfs[], dfs[], all = TRUE, sort = FALSE, :
> formal argument "all" matched by multiple actual arguments
> What do I need to do to solve that problem?
> PS: Just a related side-question: Why is merge_all not included in the
> "newer" package reshape2 as this is considered to be a reboot of the
> reshape package?
> R-help at r-project.org mailing list
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
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