[R] data transformation

From: Christian Hof <chof_at_bio.ku.dk>
Date: Tue, 22 Jul 2008 18:24:46 +0200


Dear all,

how can I, with R, transform a presence-only table (with the names of the species (1st column), the lat information of the sites (2nd column) and the lon information of the sites (3rd column)) into a presence-absence (0/1) matrix of species occurrences across sites, as given in the below example?

Thanks a lot for your help!
Christian

My initial table:

species	lat	lon
sp1	10	10
sp1	10	30
sp1	20	10
sp1	20	20
sp1	20	30
sp2	10	30
sp2	20	30
sp2	30	30


My desired matrix:

lat	lon	sp1	sp2
10	10	1	0
10	20	0	0
10	30	1	1
20	10	1	0
20	20	1	0
20	30	1	1
30	10	0	0
30	20	0	0
30	30	0	1


-- 
Christian Hof, PhD student

Center for Macroecology & Evolution
University of Copenhagen
www.macroecology.ku.dk
&
Biodiversity & Global Change Lab
Museo Nacional de Ciencias Naturales, Madrid
www.biochange-lab.eu

mobile ES .. +34 697 508 519
mobile DE .. +49 176 205 189 27
       mail .. chof_at_bio.ku.dk
      mail2 .. vogelwart_at_gmx.de
       blog .. www.vogelwart.de

______________________________________________
R-help_at_r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Received on Tue 22 Jul 2008 - 16:37:54 GMT

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.2.0, at Tue 22 Jul 2008 - 18:32:00 GMT.

Mailing list information is available at https://stat.ethz.ch/mailman/listinfo/r-help. Please read the posting guide before posting to the list.

list of date sections of archive