RE: vector()

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Subject: RE: vector()
From: Venables, Bill (CMIS, Cleveland) (Bill.Venables@cmis.CSIRO.AU)
Date: Mon 19 Jul 1999 - 09:54:59 EST


Message-ID: <D16979FB73F3D11195510000F8030FB90528A1@roper.qld.cmis.csiro.au>

You might think about using structure()

fred <- structure(vector("list", length(happy)), names = names(happy))

and in fact you can add as many attributes as you like. This seems a better
plan than tweaking vector() (where do you stop?) and maintains consistency
with S3 at this low level.

It must be said, though, this natural and innocent looking idiom that I once
used quite a lot in S3 code had nasty consequences in going from S3 to S4,
(as BDR frequently reminds me!)

Bill V.

-----Original Message-----
From: Jonathan Rougier [mailto:J.C.Rougier@durham.ac.uk]
Sent: Friday, July 16, 1999 11:13 PM
To: r-devel@stat.math.ethz.ch
Subject: vector()

Can I suggest that vector() has an additional names argument? This would
make it more comparable with matrix() and array(). I frequently find
myself doing

        fred <- vector("list", length(happy))
        names(fred) <- names(happy)

when I would rather be doing

        fred <- vector("list", length(happy), names = names(happy))

Just a thought. Cheers, Jonathan.

Jonathan Rougier Science Laboratories
Department of Mathematical Sciences South Road
University of Durham Durham DH1 3LE

"[B]egin upon the precept ... that the things we see are to be
 weighed in the scale with what we know" (Meredith, 1879, The Egoist)

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