Chuck Cleland wrote: > Should the Value: section of the help page read: > > For an array (and hence in particular, for a matrix) dim retrieves the > dim attribute of the object. It is NULL for a vector of mode integer. > > NOTE: for not or in the second sentence.
NO!!! The help page is correct! The *value* is either NULL *or* a vector of mode integer. It is always NULL for any vector without dim attribute (also for character vectors!): x <- "a" dim(x) # NULL dim(x) <- 1 dim(x) # 1 Uwe Ligges > Uwe Ligges wrote: > >> Christian Prinoth wrote: >> >> >>> Hi, if I do >>> >>> Z<-rnorm(50) >>> Followed by >>> Dim(Z) >>> I get NULL. Is this correct? Shouldn't I get 50 instead? >> >> >> >> >> No, because Z has no dim attribute. ?dim tells you: >> >> "For an array (and hence in particular, for a matrix) dim retrieves >> the dim attribute of the object. It is NULL or a vector of mode integer." >> >> >>> TIA >>> Chris >>> >>> DISCLAIMER:\ L'utilizzo non autorizzato del presente >>> messagg...{{dropped}} >>> >>> ______________________________________________ >>> 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 >> >> >> >> Yes, PLEASE do read the posting guide! >> http://www.R-project.org/posting-guide.html >> >> >> Uwe Ligges >> >> ______________________________________________ >> 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 >> >> > ______________________________________________ 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