[R] Parallel computing in Splus?
Dear All, Does anyone know if there is any function or package provides parallel computing in splus? Thanks in advance. Lun __ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
[R] A logical comparison between two character strings in R
Dear All, Does anyone know how to compare two character strings in R? For eample, how to compare A-1-B with cc-1 in logical ? Cheers, Lun Li __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
[R] A logical comparison between two character strings in R
Dear All, Can anyone know how to compare two character strings in R? For eample, how to compare A-1-B with cc-1 in logical ? Cheers, Lun Li __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
Re: [R] A logical comparison between two character strings in R
Thanks.
But, my question is:
pro.name[1]
V1
1 B-29BT3
temp.name[1]
V1
1 A-1H
if(tem.name[1]==pro.name[1]){cat(ok)}
Error in Ops.factor(left, right) : Level sets of factors are different
How to compare them?
Lun
Quoting Peter Dalgaard BSA [EMAIL PROTECTED]:
Lun Li [EMAIL PROTECTED] writes:
Dear All,
Does anyone know how to compare two character strings in R? For
eample, how
to compare A-1-B with cc-1 in logical ?
Ehhh... Is it this that you want?
A-1-B == cc-1
[1] FALSE
A-1-B = cc-1
[1] TRUE
A-1-B cc-1
[1] FALSE
d-1-B cc-1
[1] TRUE
--
O__ Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907
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[R] How to send a function to a slave from master and let the slaverun using rmpi?
Dear All, Can anyone help in how to send a function to a slave (not all slaves)from master and let the slave run using rmpi? Thanks. Lun Li __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
[R] Rmpi: send a function to a slave from master and let it run?
Hello All, Can send different functions to different slaves from master and let each slave run itself function using Rmpi? From the Rmpi version 0.4.2, I know how to send a function to all slaves and let slave run the function. mpi.send.Robj may send a function to a slave, but how let the salve run the function? Thanks. Lun __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
[R] Parallel programming using R
Dear All, For my regression problem(thousand dependents by thousand predictors by hundred months observations), I prefer to parallel computation in R. Is it possible to parallel programming using R as using C and Fortran? Cheers, Lun __ [EMAIL PROTECTED] mailing list http://www.stat.math.ethz.ch/mailman/listinfo/r-help
Re: [R] Parallel programming using R
Thank you very much for the information of RPvm and RMPI packages. I got them. Best regards, Lun From: M.Kondrin [EMAIL PROTECTED] To: lun li [EMAIL PROTECTED] CC: R-Help [EMAIL PROTECTED] Subject: Re: [R] Parallel programming using R Date: Tue, 04 Mar 2003 14:25:02 -0800 lun li wrote: Dear All, For my regression problem(thousand dependents by thousand predictors by hundred months observations), I prefer to parallel computation in R. Is it possible to parallel programming using R as using C and Fortran? Cheers, Lun __ [EMAIL PROTECTED] mailing list http://www.stat.math.ethz.ch/mailman/listinfo/r-help Look up RPvm and RMPI packages Good luck ... __ [EMAIL PROTECTED] mailing list http://www.stat.math.ethz.ch/mailman/listinfo/r-help
Re: [R] Function update problem
Dear Professor Ripley,
Thank you very much for your help.
I tested the idea by form - substitute(.~.+x[,i], list(i=i)), however the
problem still is there. In order to automate model selection, I prefer to
use update. My regression problem is to test significant predictors from
several hundred candidates using forward regression by BIC criteria. For
each loop, first to find one with maximum BIC and then to update lm to get
a new model. So, it is convenient to useupdate function. I would be
grateful if you could still help.
In addition, I tried the way update+add1 to my question. But, new problem
is update.default(model, . ~ . + x) need an object with call component,
help? The code is:
model-add1(model,.~.+form)
model.new-update(model,.~.+x)
With best regards,
Lun
You can use substitute: something like (untested)
for(i in 1:100){
form - substitute(.~.+x[,i], list(i=i))
model - update(model, form)
## do something useful in here
}
and you do not need to update unchanged arguments!
However, why are you rewriting add1.default, when there is add1.lm?
On Thu, 13 Feb 2003, lun li wrote:
Dear all,
I am trying an automatic model selection for a multiple linear
regression
using function lm and update. But, I meet a problem when using update.
The
problem is the function update can not update when variables as a
vector(for
example,x is a matrix with 100 regression variables). The code is as
below:
model-lm(y~x1,singular.ok=T,na.action=na.omit)
for(i in 1:100){
model-update(model,.~.+x[,i],singular.ok=T,na.action=na.omit)}
If the above code is represented as below, I can get the correct result.
However, I must use the loops.
model-lm(y~x1,singular.ok=T,na.action=na.omit)
model-update(model,.~.+x[,1],singular.ok=T,na.action=na.omit)
model-update(model,.~.+x[,2],singular.ok=T,na.action=na.omit)
..
model-update(model,.~.+x[,100],singular.ok=T,na.action=na.omit)
--
Brian D. Ripley, [EMAIL PROTECTED]
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UKFax: +44 1865 272595
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- End forwarded message -
Lun Li
Department of Geology and Geophysics
The University of Edinburgh
Grant InstituteTel. +44(0)131 650 7339
King's Buildings Fax. +44(0)131 668 3184
West Mains Road E-mail:[EMAIL PROTECTED]
Edinburgh EH9 3JW
UK
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