search for: ensureloc

...the object will cause internal duplication of the whole thing, in the very likely case that we pass some object, myX say as argument x to a function. As soon as the evaluator sees a replacement function, "@<-", "$<-" or "attr<-" for an ordinary object, the EnsureLocal routine calls duplicate() if the object has more than one reference, as it will in this scenario. And BigData gets copied. I think it's important to understand that this follows from the "replacement function" concept in S and R: A replacement function takes an object from the...

...r in behavior with one important exception--fixing that is the automatic change. I need to review what R does here. All these are replacement functions, `@<-`, `attr<-`, `$<-`. The evaluator checks before calling any replacement whether the object needs to be duplicated (in a routine EnsureLocal()). It does that by examining a special field that holds the reference status of the object. Some languages, such as Python (and S) keep reference counts for each object, de-allocating the object when the reference count drops back to zero. R uses a different strategy. Its NAMED() field is...

If anyone has a few extra CPU cycles to spare, I'd appreciate it if you could verify a problem that I have encountered. Run the code below and tell me if it crashes your R before completion. library(lme4) data(bdf) dump<-sapply( 1:50000, function(i) { fm <- lme(langPOST ~ IQ.ver.cen + avg.IQ.ver.cen, data = bdf, random = ~ IQ.ver.cen | schoolNR); cat("