[R] 2 simple questions

From: <sms13+_at_pitt.edu>
Date: Sat 07 May 2005 - 01:07:43 EST


Please excuse what I'm sure are very easy questions but I'm relatively new to the R environment.
How can I view a range of list elements, but not all. e.g., I had a matrix of patients and then split them out by patient id. I know I can do patlist[[1]] to see the first one, but how can I view, say, the first ten patients?

My other question is how to count how many patients have a record in which a certain condition holds. E.g., I was trying something like this to get a count:
ctr<-0
temp<-lapply(mylist, function(x){is.na(x$date1[1]) & !is.na(x$date2[1])) ctr<-ctr+1})

But I don't think that's working correctly.

Thanks,
Steven



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