[R] how to combine presence only data sets to one presence/absence table

[antu]

What about the opposite of this, This has been very helpful for me, but at
the same time, I needed the opposite of this to..

ie, this to

        spl_A	spl_B	spl_C 
spcs1	1	1	0 
spcs2	1	0	1 
spcs3	0	1	1

this

spl_A	  spl_B	spl_C 
spcs1  spcs1	spcs2 
spcs2	 spcs3	spcs3 
spcs4	 spcs5 
spcs5


Thank you

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