Hello.
Does anyone know of an existing function that takes a list in the form of:
Plot1 Species1 Abundance1
Plot1 Species2 Abundance2
Plot2 Species1 Abundance1
Plot2 Species3 Abundance3
.
.
.
PlotN SpeciesN AbundanceN
and translates into a matrix in the form of
Species1 Species2.... SpeciesN
Plot1 Abundance1 Abundance2... AbundanceN
Plot2 Abundance1 Abundance2... AbundanceN
.
.
.
PlotN AbundanceN AbundanceN... AbundanceN
This is a basic operation used in the initial stages of ordination etc of
ecological data (vegetation or other species) that is usually stored in a
database or flatfile in the list format above. It is similar to a cross
tabulation like the function xtabs(), however its useful to be able to
control whether a measured abundance for a taxa is included or a boolean
(presence/absence) for the taxa in a given plot.
Im new to such analyses in R, but before writing it myself hope or suspect
that such a function or library is out there (although I dont see it after
some quick searching in things like Vegan or BiodivesityR or labdsv).
Thanks
billy
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