[R] subtract 2 columns in a data.frame

Ulrich Leopold uleopold at science.uva.nl
Thu Sep 4 13:11:07 CEST 2003

Dear list,

could someone point me to the right command to subtract 2 columns in a
data.frame. Might be a bit embarrassing question. But I cannot figure
out how to do this simple command in R.

Thanks, Ulrich

Ulrich Leopold MSc.

Department of Physical Geography
Institute for Biodiversity and Ecosystem Dynamics
Faculty of Science
University of Amsterdam
Nieuwe Achtergracht 166
NL-1018WV Amsterdam

Phone:	+31 20 525 7456 (7451 Secretary)
Fax:	+31 20 525 7431
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Email:	uleopold at science.uva.nl
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