[R] RandomForest Proximity Matrix

Michael Lindgren
Thu, 21 Oct 2010 20:02:48 -0000

Greetings R Users!

I am posting to inquire about the proximity matrix in the randomForest
R-package.  I am having difficulty pushing very large data through the
algorithm and it appears to hang on the building of the prox matrix.  I have
read on Dr. Breiman's website that in the original code a choice can be made
between using an N x N matrix OR to increase the ability to compute large
datasets an N x T matrix can be created.  The N refers to the number of
samples and the T refers to the number of trees in the forest.  It is a
sentence in the FORTRAN documentation and nothing else is stated about it...
 My question is, does the randomForest module in R allow for this choice in
proximity matrices generated by the algorithm?  If so, can someone please
point me in the direction of how to implement it?  That would be great!

Many thanks in advance and best wishes from Alaska!

Michael

--
Michael Lindgren
GIS Technician / Programmer
EWHALE Lab - Institute of Arctic Biology
University of Alaska
419 IRVING I
Fairbanks, AK 99775-7000

Email: malindgren@alaska.edu
Phone: 907 474 7959

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