[R] Spatial: number of independent components?

[Daniel Malter]

Hi, thanks much. This works in principle. The corrected code is below:

a <- nb2mat(cell2nb(nrow(x),ncol(x),torus=T), style="B")
g <- delete.vertices(graph.adjacency(a), which(x!=1)-1)

plot(g)
clusters(g)

the $no argument of the clusters(g) function is the sought after number.
However, the function is very slow, and my machine runs out of memory (1G)
for a 101 by 101 matrix. 

Daniel
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