After upgrading to R 1.7 I constantly get this message There were 50 or more warnings (use warnings() to see the first 50) > warnings() Warning messages: 1: the condition has length > 1 and only the first element will be used in: if (is.na(ans[[i]])) next 2: ... Some things works, others not. Any suggestions? Thank you! Knud [[alternate HTML version deleted]]