Message-ID: <773926390.1115377663@Lab26.DOMAIN.IE.PITT.EDU>
Date: 2005-05-06T15:07:43Z
From: sms13+@pitt.edu
Subject: 2 simple questions
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