From: <sms13+_at_pitt.edu>

Date: Sat 07 May 2005 - 01:07:43 EST

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Sat May 07 01:27:14 2005

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.

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Sat May 07 01:27:14 2005

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