Hi,
when I pick out one element from a matrix, the attribute name is kept, but when
more than one elements are extracted, the attribute name lost;
>a<-matrix(c(1,2,3,11,12,13,45,56,76),ncol=3,dimnames=list(c(),c("c1","c2","c3")))
> k<-a[a[,"c3"]>50,"c3"]
> kk<-a[a[,"c3"]>60,"c3"]
> attributes(k)
NULL
> attributes(kk)
$names
[1] "c3"
YU
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