this thread
(http://r.789695.n4.nabble.com/how-to-combine-presence-only-data-sets-to-one-presence-absence-table-td830140.html
) covered the need for making present list list to a matrix,
Now, I ran into an opposite problem. I have a data matrix with 0, 1 on them,
what I need now is list of presence only for each column name
ie, this is what I have
spl_A spl_B spl_C
spcs1 1 1 0
spcs2 1 0 1
spcs3 0 1 1
this is what I need
spl_A spl_B spl_C
spcs1 spcs1 spcs2
spcs2 spcs3 spcs3
Thank you
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