Try this: merge(q1, q2, all = TRUE)
On Wed, Aug 10, 2011 at 12:04 PM, Anthony Ching Ho Ng <[email protected]> wrote: > Dear R-help, > > I wonder if you could give me some suggestions in how to do a union > join of two data frames as follow: > -> union join the common column, and insert a 0 if one is missing. > > I made a function to perform the following, and I know it may not that > quite welly written, but it works. > > Any suggestions are welcome, many thanks. > > Anthony > >> q1 = data.frame(a=1,b=2,c=3,row.names="q1") > a b c > q1 1 2 3 > >> q2 = data.frame(d=4,b=1,a=4, row.names="q2") > d b a > q2 4 1 4 > > -> myJoinColumns(q1,q2) > a b c d > q1 1 2 3 0 > q2 4 1 0 4 > > > myJoinColumns <- function(q1,q2){ > allNames = sort(union(colnames(q1),colnames(q2))) > for (i in 1:length(allNames)){ > t1 = which(colnames(q1) == allNames[i]) > t2 = which(colnames(q2) == allNames[i]) > > if (length(t1) == 1){ > sec1 = q1[,t1] > } else { > sec1 = 0 > } > > if (length(t2) == 1){ > sec2 = q2[,t2] > } else { > sec2 = 0 > } > > if (i == 1){ > qTable = matrix(c(sec1,sec2)) > }else{ > qTable = cbind(qTable,c(sec1,sec2)) > } > } > colnames(qTable) = allNames > rownames(qTable) = c("q1","q2") > qTable > } > > ______________________________________________ > [email protected] 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. > -- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40" S 49° 16' 22" O ______________________________________________ [email protected] 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.
