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2003 Sep 04
5
subtract 2 columns in a data.frame
...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
Mobile: +31 64 220 3028
Email: uleopold at science.uva.nl
URL: www.science.uva.nl/ibed/research/Research_Fields/fg/stafffg/index.html