I have a table such that:
sample # species
1 a
1 b
2 a
2 c
3 b
and i would like to build a matrix with species names (i.e. a b and c)
as field names and samples (i.e. 1,2 and 3) as row names
and 1/0 as inner values
such as:
a b c
1 1 1 0
2 1 0 1
3 0 1 0
I am currently using Rcmdr package for managing datasets but need a
function about.... I tried to use stack function but only with worst results
Thanks
Duccio
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