[R] dist

[Agustin Lobo]

Hi list!

I'm computing multivar. distances from a set of centroids
to a (large) set of individuals. I'm now just using rbind
to create a matrix (x) with the centroid and the individuals,
then run as.matrix(dist(x)) and finally select the appropriate columns,
as I'm not interested on the distances among individuals.
Therefore, this procedure implies a waste of computing time.
Is there any way to use dist only between each individual
and the centroids (avoiding loops in R)? or should I just go and try to
make
a modified version of dist by hacking the C code?

Thanks

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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