Full_Name: John Peters Version: 2.3.0 OS: Windows 2000, xp Submission from: (NULL) (220.233.20.203) In R2.3.0 on Windows 2000 and xp > mean(c(1i)) [1] 0+2i > mean(c(1i,1i)) [1] 0+3i > mean(c(1i,1i,1i)) [1] 0+4i OK in R2.2.1