cluster/snow question

Dear R Users,

I am attempting to use the snow package for clustering. Is there a way to 
identfy, in the environment of each node, a rank for that node and also, 
the total size of the cluster ? 

By way of analogy, I am looking for the functions in snow equivalent to 
mpi.comm.rank() and mpi.comm.size() from RMPI, in case that makes things 
clearer.

Thanks in advance,
Tolga

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Hi Markus,

Many thanks. Is the "cluster" variable you mention below available in the
environment of the nodes ? Specifically, within that environment, how
could one identify the rank of that specific node ?

My code would use that information to partition the problem.

Thanks,
Tolga




Markus Schmidberger <schmidb at ibe.med.uni-muenchen.de>
09/09/2008 07:11
Please respond to
schmidb at ibe.med.uni-muenchen.de


To
tolga.i.uzuner at jpmorgan.com
cc
r-help at r-project.org
Subject
Re: [R] cluster/snow question






Hi Tolga,

in SNOW you have to start a cluster with the command

library(snow)
cluster <- makeCluster(#nodes)

The object "cluster" is a list with an object for each node and each
object again is a list with all informations (rank, comm, tags)
The size of the cluster is the length of the list.

#nodes == length(cluster)

E.g. the rank for node one you can get by

cluster[[1]]$rank

Best
Markus

tolga.i.uzuner at jpmorgan.com schrieb:

Dear R Users,

I am attempting to use the snow package for clustering. Is there a way

to

identfy, in the environment of each node, a rank for that node and also,

the total size of the cluster ?

By way of analogy, I am looking for the functions in snow equivalent to
mpi.comm.rank() and mpi.comm.size() from RMPI, in case that makes things

clearer.

Thanks in advance,
Tolga

Generally, this communication is for informational purposes only
and it is not intended as an offer or solicitation for the purchase
or sale of any financial instrument or as an official confirmation
of any transaction. In the event you are receiving the offering
materials attached below related to your interest in hedge funds or
private equity, this communication may be intended as an offer or
solicitation for the purchase or sale of such fund(s).  All market
prices, data and other information are not warranted as to
completeness or accuracy and are subject to change without notice.
Any comments or statements made herein do not necessarily reflect
those of JPMorgan Chase & Co., its subsidiaries and affiliates.

This transmission may contain information that is privileged,
confidential, legally privileged, and/or exempt from disclosure
under applicable law. If you are not the intended recipient, you
are hereby notified that any disclosure, copying, distribution, or
use of the information contained herein (including any reliance
thereon) is STRICTLY PROHIBITED. Although this transmission and any
attachments are believed to be free of any virus or other defect
that might affect any computer system into which it is received and
opened, it is the responsibility of the recipient to ensure that it
is virus free and no responsibility is accepted by JPMorgan Chase &
Co., its subsidiaries and affiliates, as applicable, for any loss
or damage arising in any way from its use. If you received this
transmission in error, please immediately contact the sender and
destroy the material in its entirety, whether in electronic or hard
copy format. Thank you.
Please refer to http://www.jpmorgan.com/pages/disclosures for
disclosures relating to UK legal entities.
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