Dear all, I'm a relative new user of R and I have a problem with merging a collection of matrices. All matrices in this collection have the same dimension (532 rows and 532 columns), but can differ in the row and columns names. I'd like to merge these matrices in such a way that the resulting matrix only contains unique row- and column-names and that in case of a match between the row or column names the smallest value is retained.
As an example says more: A1<-matrix(c(1:9), ncol=3, byrow=TRUE) rownames(A1)<-colnames(A1)<-c("a","b","c") A1 a b c a 1 2 3 b 4 5 6 c 7 8 9 A2<-matrix(c(7,1,3,10,2,7,3,1,8),ncol=3,byrow=TRUE) rownames(A2)<-colnames(A2)<-c("a","y","z") A2 a y z a 7 1 3 y 10 2 7 z 3 1 8 I want something like this to be returned: a b c y z a 1 2 3 1 3 b 4 5 6 NA NA c 7 8 9 NA NA y 10 NA NA 5 6 z 3 NA NA 8 9 Many thanks, Jurgen I'm using: R-2.9.1 (2009-06-26) on a windows XP platform. [[alternative HTML version deleted]] ______________________________________________ R-help@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.