[R] multivariate distance and apply

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From: Agustin Lobo (alobo@ija.csic.es)
Date: Tue 24 Jul 2001 - 01:27:34 EST 

Message-id: <Pine.OSF.3.96.1010723172556.24289A-100000@ija.csic.es>

Hi!

I'm computing a mutivariate distance that is
not among the different options of dist. Hence
I've written
midistancia(v1,v2)
where v1 and v2 are vectors.

Now, I have to calculate the distances between
one given vector (V1) and a number of vectors
arranged as the rows of a matrix (stat). I'm
using

apply(stat, 1, midistancia, V1)

to apply midstancia to each row of stat.

The question is: is this the most efficient method
in R or is there a faster way to calculate midistancia
between V1 and the rows of stat?
(stat can become ~80000 rows x 7 cols)

Thanks

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@ija.csic.es

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