Good morning!

I need to create a binary matrix with all node of a phylogenetic tree and the 
presence of each taxo in their respective node. 

Example: 

require(ape) 
y<-read.tree(text="(E,((H,I)D,(F,G)C)B)A;") 
y 
plot(y, show.node=TRUE) 

I need to create a binary matrix as follows: 

        A        B      C        D 
G       1       1       1       0 
F       1       1       1       0 
I       1       1       0       1 
H       1       1       0       1 
E       1       0       0       0 

Somebody could help me to solve this problem. 

Thanks,

Vanderlei Debastiani
Laboratório de Ecologia Filogenética e Funcional
Programa de Pós-Graduação em Ecologia
Universidade Federal do Rio Grande do Sul
www.ufrgs.br/leff

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