Yes, once I've named the first column, I can add further ones by saying
d[c("x","y","z")]=NA or such. I was just wondering whether that was the way to
do it or whether there was a more elegant approach. Preallocation was the
critical clue I needed.
Thanks again for your help,
David.
------------------------------------------------------------------------
Dr David Philip Kreil ("`-''-/").___..--''"`-._
Research Fellow `6_ 6 ) `-. ( ).`-.__.`)
University of Cambridge (_Y_.)' ._ ) `._ `. ``-..-'
++44 1223 764107, fax 333992 _..`--'_..-_/ /--'_.' ,'
www.inference.phy.cam.ac.uk/dpk20 (il),-'' (li),' ((!.-'
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