Merge 10 data frames with 3 id columns that are common to all data frames
I tried using merge_all as shown below but I am getting an error ... can anyone tell me what I am doing wrong? The result table below is what I am looking for. DF1 <- data.frame(var1 = letters[1:5], x = rnorm(5), y =2) DF2 <- data.frame(var1 = letters[1:5], t = rnorm(5), u =2) DF3 <- data.frame(var1 = letters[1:5], d = rnorm(5), e =31) DF4 <- data.frame(var1 = letters[1:5], f = rnorm(5), o =11) DF_all <- merge_all(DF1, DF2, DF3, DF4, by="var1" ) Error in fix.by(by.x, x) : 'by' must specify column(s) as numbers, names or logical Results I would like var1 x y d e t u x a -1.725155 2 -0.48097 31 0.032968 2 -1.725155 b 0.799983 2 2.32965 31 -0.385364 2 0.799983 c -1.387224 2 0.61761 31 0.977404 2 -1.387224 d 0.645946 2 0.46152 31 1.334591 2 0.645946 e 0.058783 2 -0.25312 31 0.631676 2 0.058783
baptiste auguie-2 wrote:
Hi, Try this:
DF1 <- data.frame(var1 = letters[1:5], x = rnorm(5), y =2) DF2 <- data.frame(var1 = letters[3:7], x = rnorm(5), y=3) DF3 <- data.frame(var1 = letters[6:10], x = rnorm(5), y=0) # ... DF10 if you wish ( result <- merge_all(list(DF1, DF2, DF3) )) save( result, file ="merged.rda")
I didn't know of this function, thanks. Similar solutions using base functions were proposed recently on http://wiki.r-project.org/rwiki/doku.php?id=tips:data-frames:merge and i've now added this for reference. baptiste On 8 Mar 2009, at 20:23, Pele wrote:
Hi R users, Can anyone share some example code using merge_all (from the reshape package) to merge 10 data frames into 1 file. Thanks in advance for any help! -- View this message in context: http://www.nabble.com/Merge-10-data-frames-with-3-id-columns-that-are-common-to-all-data-frames-tp22402493p22402493.html Sent from the R help mailing list archive at Nabble.com.
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_____________________________ Baptiste Augui? School of Physics University of Exeter Stocker Road, Exeter, Devon, EX4 4QL, UK Phone: +44 1392 264187 http://newton.ex.ac.uk/research/emag ______________________________________________ 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.
View this message in context: http://www.nabble.com/Merge-10-data-frames-with-3-id-columns-that-are-common-to-all-data-frames-tp22402493p22404595.html Sent from the R help mailing list archive at Nabble.com.