Dear all,
how can I, with R, transform a presence-absence (0/1) matrix of species
occurrences into a presence-only table (3 columns) 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), as given in the below
example?
Thanks a lot for your help!
Christian
my dataframe:
site lat lon spec1 spec2 spec3 spec4
site1 10 11 1 0 1 0
site2 20 21 1 1 1 0
site3 30 31 0 1 1 1
my desired new dataframe:
species lat lon
spec1 10 11
spec1 20 21
spec2 20 21
spec2 30 31
spec3 10 11
spec3 20 21
spec3 30 31
spec4 30 31
--
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 .. [EMAIL PROTECTED]
mail2 .. [EMAIL PROTECTED]
blog .. www.vogelwart.de
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