Ciao Giovanni,

Try this.

x<-matrix(sample(0:4,25,replace=T),nc=5)
x
x[x>0]<-1
x

Miltinho
uno capoeirista brasiliano

----- Mensagem original ----
De: giovanni bacaro <bacaro@unisi.it>
Para: r-help@stat.math.ethz.ch
Enviadas: Segunda-feira, 17 de Dezembro de 2007 14:03:34
Assunto: [R] convert table

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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