Full_Name: Leo van Romunde Version: 2, 1, 0 OS: Win XP prof. sp1 Submission from: (NULL) (81.58.34.90) When we type the following R gives an error: > a = c(1, 2) > b = c(1, 2) > boxplot (a ~ b) Error in list(a, b) : invalid 'envir' argument When we do exactly the same on another machine (Win2000) it works correctly. Any suggestions?