Hi if you do not insist on switch you can use factor to get desired result
set.seed(666) x<-sample(1:5,20, replace=T) x [1] 4 1 5 2 2 4 5 3 1 2 4 1 1 1 2 5 1 5 3 3 factor(x, labels=letters[1:5]) [1] d a e b b d e c a b d a a a b e a e c c Levels: a b c d e r-help-boun...@r-project.org napsal dne 09.06.2010 12:36:26: > Hi all, Here I am trying to implement the switch() function to choose value of > a variable depending on the value of an input variable : > > temp1 <- "1" > temp1.name <- switch(temp1, > 1 == "aa", > 2 == "bb", > 3 == "cc", > 4 == "dd", > 5 == "ee") > > Goal is if "temp1" equals to 1, then value of temp1.name would be "aa". > However I am getting following answer : > > > temp1 <- "1" > > temp1.name <- switch(temp1, > + 1 == "aa", > + 2 == "bb", > + 3 == "cc", > + 4 == "dd", > + 5 == "ee") > > temp1.name > [1] FALSE > > > Can anyone please point me where I am doing wrong? Have you looked at help ?switch Arguments EXPR an expression evaluating to a number or a character string. ^^^^^^^^^^^^^^^^^^^^^^ ... the list of alternatives. If it is intended that EXPR has a character-string value these will be named, perhaps except for one alternative to be used as a ‘default’ value. So in your case temp1 <- "1" temp1.name <- switch(temp1, "1" = "aa", "2" = "bb", "3" = "cc", "4" = "dd", "5" = "ee") Basically switch compares your temp1 with all LHS alternatives, if it match it returns RHS. If it does not it will return NULL and in your case it returned probably value 1=="aa" which is FALSE. Regards Petr > > Thanks, > > > > [[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. ______________________________________________ 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.