Merging list of dataframes with reshape merge_all
Hello,
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.
maintainer('reshape')
[1] "Hadley Wickham <h.wickham at gmail.com>"
Hope this helps,
Rui Barradas
Em 11-01-2013 10:08, Johannes Radinger escreveu:
Hi,
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:
merge(df1,df2,by=c("col1","col2","col3"),all=TRUE)
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):
merge_all(list(df1,df2),by=c("col1","col2","col3"),all=TRUE)
but I get following error:
Error in merge.data.frame(dfs[[1]], dfs[[2]], 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?
/johannes
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