[R] dist(a,b) ??? knn1?

Jens Oehlschlägel joehl at gmx.de
Fri Jun 21 12:48:27 CEST 2002


your suggestion is fine for small data sets, but dist() has o(2) memory and
calculation time requirements. 

I assume that Ryszard wanted a function that does ONLY calculate distances
between all combinations of two sets of data rows for perfomance reasons. E.G.
knn1 of library class having parameters train= and test= might do that
internally. However, I am not aware of such a C-function directly interfaceable
from R.

So I like to repeat Ryszard's question as I understand it: is there any
C-function in R allowing to calculate such distances efficiently?

Thanks for any hints

Jens Oehlschlägel


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