search for: prexprs

I'm noticing some interesting behavior in `match.call` in some corner-ish cases that arise when you try to use `match.call` to match a "grandparent" function and there are dots involved: fun0 <- function(a, ...) fun1(...) fun1 <- function(b, ...) fun2() fun2 <- function() match.call( fun1, sys.call(sys.parent()), expand.dots=FALSE,

Hi all, It seems that there is a use case for obtaining the environment for the "top" promise. By "top", I mean following the promise chain up the call stack until hitting a non-promise. S4 data containers often mimic the API of base R data structures. This means writing S4 methods for functions that quote their arguments, like with() and subset(). The methods package

I was thrilled to see this in the change log: > match.call() gains an envir argument for specifying the environment from which to retrieve the ... in the call, if any; this environment was wrong (or at least undesirable) when the definition argument was a function. This was an issue I ran into a few years ago.? I ended up writing my own version that allows specification of the environment, but

...nto it. Duncan > > ---------------------------------------------------------------------------- > r37269 | murdoch | 2006-02-05 18:00:54 +0100 (Sun, 05 Feb 2006) | 7 lines > > Changes to substitute and findVar: > In C, substitute( , R_NilValue) does no substs, just > getting PREXPRs, while substitute( , R_GlobalEnv) does > substitutions. > > In R: substitute( , .GlobalEnv) is just like > R_NilValue above, as is substitute( , NULL). > ---------------------------------------------------------------------------- > > Regards, > Martin > > > --...

Hello everyone, I've just attempted to build R-1.4 on Compaq Tru64 (I'll enclose the text from bug.report() from R-1.3.1 at the end.) The relevant part of the log is below. Any ideas? gcc -shared -o methods.so do_substitute_direct.o methods_list_dispatch.o method_meta_data.o slot.o -L/usr/local/lib /usr/ucb/ld: Warning: Unresolved: TYPEOF Rf_error Rf_protect Rf_substitute

I've rolled up R-1.8.0.tgz a short while ago. This is a new version with major changes (see below). Notably, the Macintosh version for OS X has been substantially improved; the old Carbon interface is no longer being supported. Also notice that the underscore will no longer work as an assignment operator. There is also a bunch of new functions and an assortment of bugs have been fixed. You

I've rolled up R-1.8.0.tgz a short while ago. This is a new version with major changes (see below). Notably, the Macintosh version for OS X has been substantially improved; the old Carbon interface is no longer being supported. Also notice that the underscore will no longer work as an assignment operator. There is also a bunch of new functions and an assortment of bugs have been fixed. You