Hello all,
I am looking for books to help me gain a firmer grasp on the S/R
programming language , programing / data structures etc. it seems that
for this purpose two books are typically recommended:
Programming with Data: A Guide to the S Language, John M. Chambers and
Although it was published in 1998, I hardly find it outdated. Still a good reference, but as far as I know, not everything is implemented in R.
S Programming by Venables & Ripley.
- The Chambers book is published 1998. is it a bit dated at this point. - is the Venables and Ripley's book a good source on the design and manipulation of data structures in R (it seems mostly focused on R extensions). - are there any other books, possibly published more recently, that you could recommend.
Modern Applied Statistics in S (4th ed.) by Venables & Ripley is not so much about the language itself but is always a good reference.
I also have a couple of particular programming questions:
-coming from a C++/java programming background I found that I often end up in R with lists of objects (each constructed, in turn, as a list, say list(x=x,y=y,z=z)). often, these individual objects have recursive 'attributes' so a matrix representation of this set of objects is not an option. although a data.frame might be. I typically need to access certain attributes of these objects for plotting or analysis etc. however, I have not been able to come up with a clean way to do this? e.g.
object.list = list(o1=list(x=1,y=2,z=3), o2=list(x=11,y=22,z=33))
what I would like to do is say get a vector of x values for the objects in object.list, but something like object.list[[1:length(object.list)]]$x, for example, returns NULL.
You can use sapply:
sapply(object.list, "[[", "x")
is there a better way to set up such an object list data structure that will allow me to do this?
- what is the correct way to -remove- a component from a list. this
seems to do the trick: list[[1]] = NULL, however, you'd think this
should simply attach a NULL object at the first component position?
many thanks for any help
-roger
______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
