[R] Problem with data.frames

Simon Fear Simon.Fear at synequanon.com
Mon Aug 4 17:19:04 CEST 2003

You believed right - I do indeed lack the vision of others to foresee
practical need to attach and detach within a recursive function, except
perhaps for my own amusement. Should I do the recursive call in between
attach and detach, I wonder? Wouldn't it all be fun, watching that
path grow and grow, before the function eventually hit the first detach!
just imagine the hilarity you could have, attaching and detaching at
different positions! I could have a thousand identical data sets, all

It's one of the many situations in which I would very much like to get a
warning or error message, pointing out to me that I had absolutely no
what I was doing.

Surely that's what warnings are for? For those of us who wonder why our
doesn't do what we think it should, until a long time after the


-----Original Message-----
From: Prof Brian Ripley [mailto:ripley at stats.ox.ac.uk]
Sent: 04 August 2003 14:34
To: Simon Fear
Cc: r-help at stat.math.ethz.ch
Subject: RE: [R] Problem with data.frames

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Think about what happens if you call a function recursively, e.g. by 
Recall(), and that function includes an attach/detach pair.

I believe it is your vision that is too limited, not other people's.

Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

Simon Fear
Senior Statistician
Syne qua non Ltd
Tel: +44 (0) 1379 644449
Fax: +44 (0) 1379 644445
email: Simon.Fear at synequanon.com
web: http://www.synequanon.com
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