dear R-friends,
i`ve got a large dataset of vegetation-samples with about 500 variables(=species) in the following format:
1 spec1 1 spec23 1 spec54 1 spec63 2 spec1 2 spec2 2 spec253 2 spec300 2 spec423 3 spec20 3 spec88 3 spec121 3 spec200 3 spec450 . .
this means: sample 1 (grassland) with the species (=spec) 1, 23, 54, 63
is it possible to get a following data-structure for further analysis?
1 2 3 ...... spec1 1 1 0 spec2 0 1 0 spec3 ... spec253 0 1 0 ... spec450 0 0 1
It appears that you want to form a crosstabulation. If so, you can use the table or xtabs functions. I suggest you look at the documentation and examples of those and see if they will be suitable.
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