E.g.,
mydata$difference <- mydata$x - mydata$y
That's what I thought, but I get the following message:
> propLSK.STONE.Pox0t30$Pox0t30STONE-propLSK.STONE.Pox0t30$Pox0t30 numeric(0)
Does it mean the resulting vector is empty? If yes, what could be the reason for it? Both columns are available:
UGreen Pox0t30 Pox0t30Stone 1 0 37.150000 16.461500 2 0 6.833330 7.464404 3 0 9.750000 15.616870 4 0 15.050000 19.146500 5 0 13.266700 10.515750 6 0 34.300000 27.304840 7 0 45.800000 27.217171 8 NA 23.200000 16.844601 9 0 13.600000 28.051821 10 0 16.750000 6.021914 11 0 16.433300 3.832123 12 0 17.333300 3.905555
What am I missing?
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
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