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Alex Rivera
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Complicated title but here is a simple example of what I am trying to achieve: d <- data.frame(v1 = c(1,2,3,4,5,6,7,8), v2 = c("A","E","C","B","B","C","A","E")) m <- data.frame(v3 = c("D","E","A","C","D","B"), v4 = c("d","e","a","c","d","b")) Values in d$v2 should be replaced by values in m$v4 by matching the values from d$v2 in m$v3 The resulting data frame d should look like: v1 v4 1 a 2 e 3 c 4 b 5 b 6 c 7 a 8 e I tried different stuff and the closest I came was: d$v2 <- m$v4[which(m$v3 %in% d$v2)] I try to avoid any for-loops again! Must be possible :-) somehow... ;)
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