User:Timothee Flutre/Notebook/Postdoc/2011/11/09
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links <- data.frame(id1=c("a","b","c"), id2=c("1","2","3"), stringsAsFactors=FALSE) mat <- matrix(runif(3*10), nrow=3) rownames(mat) <- c("b","c","a") new.rownames <- unlist(lapply(rownames(mat), function(i){links$id2[which(links$id1 == i)]})) rownames(mat) <- new.rownames Or it's maybe easier with the built-in replace function. |