Grokbase Groups R r-help April 2002
FAQ

On Thu, 18 Apr 2002, Ambrosini Alessandro wrote:

Hello! Two questions:

1: I have to import a matrix of adjacency from a file of a software that is
not R (for example "bloc notes" of Windows). The problem is that the matrix
is not in the explicit form as
0 1 1
1 0 0
1 0 0
but it is a scattered matrix where in each row there are two nodes that have
a direct path.
The matrix is

a b
a c
b a
c a
I would use table():
d1 <- c("a","a","b","c")
d2 <- c("b","c","a","a")
table(d1,d2)
d2
d1 a b c
a 0 1 1
b 1 0 0
c 1 0 0


But is this not a very unefficient way of storing adjacencies?

Agus

Dr. Agustin Lobo
Instituto de Ciencias de la Tierra (CSIC)
Lluis Sole Sabaris s/n
08028 Barcelona SPAIN
tel 34 93409 5410
fax 34 93411 0012
alobo at ija.csic.es




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