[R] Presence/ absence data from matrix to single column

agoijman agoijman at cnia.inta.gov.ar
Sun Oct 7 16:35:42 CEST 2012

The problem with that, is that I just wrote an example of my database, but I
have around 250 species and more than 500 sites. In the approach you show
me, it looks like I have to enter every species name and sites individually,

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