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spcs1
2007 Jul 18
3
how to combine presence only data sets to one presence/absence table
...(presence only).
Data is stored in a excel spreadsheet and the columns (spl) have
different numbers of observations (spcs).
Now I want to organize the data in a species by sample matrix with
presence/absence style in R.
data style (in excel):
spl_A spl_B spl_C
spcs1 spcs1 spcs2
spcs2 spcs3 spcs3
spcs4 spcs5
spcs5
desired style:
spl_A spl_B spl_C
spcs1 1 1 0
spcs2 1 0 1
spcs3 0 1 1
.
.
.
How and in which form do I import the data to R?
(read.table() seems not to be appropriate, as data is not organized as a table)
How can I create the species by sample matrix?
Thanks for any help,
Patrick...