User:Timothee Flutre/Notebook/Postdoc/2011/11/09: Difference between revisions
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(Autocreate 2011/11/09 Entry for User:Timothee_Flutre/Notebook/Postdoc) |
(→Entry title: replace rownames with mapping when different order) |
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==Entry title== | ==Entry title== | ||
* in R, replace the row names of a matrix by their new names when the order is different (but assuming one-to-one mapping): | |||
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 | |||
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Revision as of 12:47, 9 November 2011
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Entry title
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 |