-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of sms13+ at pitt.edu
Sent: Friday, May 06, 2005 8:08 AM
To: r-help at stat.math.ethz.ch
Subject: [R] 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