Understood, that's what I'll do. I'm thinking of exporting the number of 
nodes to all nodes and passing in the node rank as 1:nonodes through 
clusterApply.
Thanks all,
Tolga




Luke Tierney <luke@stat.uiowa.edu> 
09/09/2008 20:11

To
tolga.i.uzuner@jpmorgan.com
cc
schmidb@ibe.med.uni-muenchen.de, r-help@r-project.org
Subject
Re: [R] cluster/snow question






On Tue, 9 Sep 2008, tolga.i.uzuner@jpmorgan.com wrote:

> 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 ?

No -- that isn't the way snow works.  With snow the partitioning is
done on the master. If you need a node to know how many other nodes
there are or which index it represents in a clusterApply call then you
need to pass that information in the arguments.

luke

>
> My code would use that information to partition the problem.
>
> Thanks,
> Tolga
>
>
>
>
> Markus Schmidberger <schmidb@ibe.med.uni-muenchen.de>
> 09/09/2008 07:11
> Please respond to
> schmidb@ibe.med.uni-muenchen.de
>
>
> To
> tolga.i.uzuner@jpmorgan.com
> cc
> r-help@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@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.
>>                [[alternative HTML version deleted]]
>>
>> ______________________________________________
>> R-help@r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>
>
> --
> Dipl.-Tech. Math. Markus Schmidberger
>
> Ludwig-Maximilians-Universit?? M??chen
> IBE - Institut f?? medizinische Informationsverarbeitung,
> Biometrie und Epidemiologie
> Marchioninistr. 15, D-81377 Muenchen
> URL: http://ibe.web.med.uni-muenchen.de
> Mail: Markus.Schmidberger [at] ibe.med.uni-muenchen.de
> Tel: +49 (089) 7095 - 4599
>
>
>
>
>
> 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.
>                [[alternative HTML version deleted]]
>
>

-- 
Luke Tierney
Chair, Statistics and Actuarial Science
Ralph E. Wareham Professor of Mathematical Sciences
University of Iowa                  Phone:             319-335-3386
Department of Statistics and        Fax:               319-335-3017
    Actuarial Science
241 Schaeffer Hall                  email:      luke@stat.uiowa.edu
Iowa City, IA 52242                 WWW:  http://www.stat.uiowa.edu



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.
	[[alternative HTML version deleted]]

