Inherit names ...

No doubt an easy answer to this exists.

I have a data frame which comprises 4 matrices and 2 vectors:

year(1024,6),growth(1024,6),ycens(1024,6),gcens(1024,6),yinit(1024),ginit(1024)

The names of the 26 columns get denoted as y.1 to y.6, g.1 to g.6, yc.1 to
yc.6, gc.1 to gc.6, yi and gi as these are the internal names.

I wish to make a subset of the data using the logical vector R1(length
1024) so that only the cases where R1 is TRUE are included.  I can do this
by:

R1data<-alldata[R1]

that gives a vector 7800 long (there are 300 TRUE's in R1) so I do

R1data<-as.data.frame(alldata[R1])

which gives a matrix 7800x1

so I write:

R1data<-alldata[R1];dim(R1data)<-c(300,26)

which gives the data in the right form except I haven't inherited the
names at all.  

(a) How to do that?  

(b) Is there a convenient one-liner (or more) where I can just write
something like the first expression (which is intuitive) but where it can
inherit the column names (and possibly further attributes)

(c) Is there a way within a data frame to refer conveniently to a group of
columns (ie one of the constituent matrices in the case above)? 

TIA

\John

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