nested for loop in R, using variable in title , -


can tell me what's wrong following syntax in r, , how can use variable "i" , "n" in text, title of plot?

 j <- c(5,10,15,20)  (n in j){      (i in 1:n) {            cl[i] <- subset(data, data$cluster[n] == [i])        ...         plot( ...., main="cl[i] , cluster[n]")  }}  error: unexpected '[' in: "for (i in 1:n) { cl[i] <- subset(data, data$cluster[n] == ["

use paste or paste0 command:

plot( ...., main=paste0("cl[", i, "] , cluster[", n, "]"))

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