[R] 2 simple questions

Berton Gunter gunter.berton at gene.com
Fri May 6 17:31:40 CEST 2005

Your questions are confusing because you don't seem to understand R's basic
data structures and manipulations. Please read the "Introduction to R"
manual and appropriate portions of the R languuage definition before

-- Bert Gunter
Genentech Non-Clinical Statistics
South San Francisco, CA
"The business of the statistician is to catalyze the scientific learning
process."  - George E. P. Box

> -----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
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