[R] Inherit names ...

Thomas Lumley thomas at biostat.washington.edu
Wed Jan 20 20:30:33 CET 1999

On Wed, 20 Jan 1999, John Logsdon wrote:

> 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]

R1data<-alldata[R1,] is what you want (note the comma)

> (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)? 

would give the first, third, fifth, and eleventh through twentieth
columns, or you can refer to them by name: eg

Thomas Lumley
Assistant Professor, Biostatistics
University of Washington, Seattle

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