[R] convert table

From: giovanni bacaro <bacaro_at_unisi.it>
Date: Mon, 17 Dec 2007 18:03:34 +0100


Dear R user, a very simple question:
I have a table like this:

coor	v1	v2	v3
x1	12	33	123	
x2	1	123
x3	12	
x4	33	1

and I'd like to tranform this matrix in presence/absence data.frame

coor	1	12	33	123
x1	0	1	1	1	
x2	1	0	0	1
x3	0	1	0	0	
x4	1	0	1	0

Could you suggest me a direct way to do this? Thank you
Giovanni



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