Displaying 20 results from an estimated 3000 matches similar to: "multicore - no parallel"
2009 Sep 24
2
more strange behavior of Revolution R 1.3.0
It runs more than twice as slowly using 8 core than using a single core
in inverting large matrix. Tested on 8 core Windows XP 64 machine.
> n = 1000
> n.simu = 100
> func1 = function()
+ {
+ x = rnorm(n*n)
+ dim(x)=c(n,n)
+ y = solve(x)
+ }
>
> setMKLthreads(1)
> system.time(for(i in 1:n.simu) func1())
user system elapsed
69.48 2.42 71.91
2009 Oct 08
3
foreach loop - rejection method
Hi Everybody,
Thanks in advance for your help.
This is my first time using the foreach statement and I cant get it to work
properly so here is what i have
test<-function(){
repeat {
cand2[l-1]<-rinvgamma(1,phi,lambda[l-1])
q2<-dinvgamma(cand2[l-1],phi,lambda[l-1])
p2<-cand2[l-1]^-1.5*exp(-y[l]^2/(2*cand2[l-1]))*exp(-((log(cand2[l-1])-mu_t_cand[l-1])^2)/2*sigmasq)
2009 Feb 13
2
Identifying graphics files produced by R
Oftentimes, I see graphs on the web that *look* like they've been
produced by R, but I can never be sure. Or can I? I notice that
PostScript files include a "%%%Creator: R Software" line, but do R
graphics drivers encode any identifying information in GIF or PNG
files more commonly used on the web? And of so, would such evidence
necessarily be obliterated in post-processing (e.g
2009 Oct 21
5
News on R "s largest corporate partner REVolution Computing and SPSS CEO:
Start the REvolution without me...
http://danesecooper.blogs.com/divablog/2009/10/start-the-revolution-without-me.html
*From Danese Cooper's Blog*
Some of you may have become aware of REvolution
Computing<http://revolution-computing.com/>,
a commercial open source company organized around the R
Language<http://www.r-project.org/>,
when I joined in March
2009 Oct 05
4
Ubuntu, Revolutions, R
For those who don't follow Ubuntu development carefully, the first Beta for the
next Ubuntu was recently released, so I took my home system and upgraded to
help out with filing bugs, etc.
Just to be clear, I am not looking for help with the upgrade process. I've had
R, and a few miscellaneous CRAN packages installed on this computer for years.
Today, when I loaded an R session I had
2009 Oct 05
4
Ubuntu, Revolutions, R
For those who don't follow Ubuntu development carefully, the first Beta for the
next Ubuntu was recently released, so I took my home system and upgraded to
help out with filing bugs, etc.
Just to be clear, I am not looking for help with the upgrade process. I've had
R, and a few miscellaneous CRAN packages installed on this computer for years.
Today, when I loaded an R session I had
2009 Feb 06
2
does R plus 3.3 need vista ?
Hi all - has anyone ot and experienced problems with R+.
Have downloaded the trail and it will not work -does it need vista (like it
says on the box!)
Thanks
glenn
[[alternative HTML version deleted]]
2009 Oct 23
3
How to make R packages?
I found the following document on making R packages. But it is old.
I'm wondering if there is more current ones and hopefully more
complete ones.
http://biosun1.harvard.edu/courses/individual/bio271/lectures/L6/Rpkg.pdf
2009 May 01
1
Last month on the Revolutions blog
I write about R every weekday at?http://blog.revolution-computing.com
. In case you missed them, here are some articles from the month of
April of particular interest to r-help subscribers. Thanks to everyone
who has been following the blog and sending me messages and/or leaving
comments -- it always brightens my day to hear from readers!
http://tinyurl.com/cy7x9a?(from April 1) announced the new
2009 Sep 17
2
Which one shall I use? '=' or '<-'?
Hi,
I was told to use "<-" instead of "=" in the mailing list. I am
wondering what the difference between them?
Regards,
Peng
2009 Mar 16
6
R with MKL
Hi,
I have seen a lot of problems from people trying to compile R with
MKL. So I am writing my experience in case it helps and to ask one
question. I installed R-2.8.1.patched in Ubuntu 9.04 (gcc 4.3.3) using
MKL 10.1.1.019.
I configured correctly (following MKL userguide) with :
sudo ./configure --with-blas="-I/opt/intel/mkl/10.1.1.019/include
-L/opt/intel/mkl/10.1.1.019/lib/em64t
2009 Mar 16
6
R with MKL
Hi,
I have seen a lot of problems from people trying to compile R with
MKL. So I am writing my experience in case it helps and to ask one
question. I installed R-2.8.1.patched in Ubuntu 9.04 (gcc 4.3.3) using
MKL 10.1.1.019.
I configured correctly (following MKL userguide) with :
sudo ./configure --with-blas="-I/opt/intel/mkl/10.1.1.019/include
-L/opt/intel/mkl/10.1.1.019/lib/em64t
2009 Jul 01
2
Revolutions blog: June roundup
I write about R every weekday at http://blog.revolution-computing.com
. In case you missed them, here are some articles from last month of
particular interest to R users.
http://bit.ly/tygLz announced the release of the "foreach" and
"iterators" packages on CRAN, for simple scalable parallel programming
in R.
http://bit.ly/FDS67 linked to Thomas Levin's Joy-Division-esque
2009 Jul 30
3
R User Group listings
There are now several R geographic user groups, and a few have mailing
lists on the R mailing list system. Thanks to Martin M, there's also a
pointer to a page I'm maintaining to list/describe the groups. The page
is at
http://macnash.telfer.uottawa.ca/RUG.html
Contact me if you have a listing. I'm prepared to wikify it if there is
sufficient interest.
John Nash
2009 Mar 18
3
numeric equality
Dear all,
I am totally confused by the following R output, but don't have a clue
for it.
> a <- 1 - 0.2
> a == 0.8
[1] TRUE
> a <- 1 - 0.8
> a == 0.2
[1] FALSE
> a <- 1 - 0.5
> a == 0.5
[1] TRUE
> a <- 1 - 0.6
> a == 0.4
[1] TRUE
> a <- 1 - 0.9
> a == 0.1
[1] FALSE
My R version is Windows XP R version 2.8.1 (2008-12-22).
2009 Jul 01
1
Are there any bloggers amoung us going to useR 2009 ?
*(note*: This is an R community question, not a statistical nor coding
question. Since this is my first time writing such a post, I hope no one
will take offence of it.)
Hello all,
I will be attending useR 2009 next week, and was wondering if there are any
of you who are *bloggers *intending to participate and report on useR 2009?
If so - I would love to know your blogs URL so as to follow you.
2009 Mar 11
2
Building R for Vistax64
Hi all,
I have successfully built from source the 32-bit version of R on my
Vista 64-bit box. I was hoping to graduate to a 64-bit version so I
could analyze some larger data sets. I have 8gb RAM installed.
I downloaded the latest 64-bit versions of Perl and MinGW but wasn't
sure how to edit the source code to have it build using the 64-bit
versions. I did change my PATH variable to
2009 Oct 05
1
Characters vs. factors
It seems like a recent trend in R has been to make character vectors
and factors almost equivalent (apart from the way that factors always
remember their original range). There are a few exceptions:
* summary.character != summary.factor
* table(x, exclude = NULL) != table(factor(x), exclude=NULL) when x
includes missing values
* strsplit on a factor
> strsplit(factor(c("a",
2009 Jan 08
3
Regarding Books on R
Hi,
I have good understanding on Econometrics and statistical techniques.
However, I am new to R. What would be the best way to learn R as I would
be one of the few in my team started exploring R in your team. I have got a
few downloads on R introduction, but I am not a FAN of online reading. Can
some one guide me with some books on R and statistical models using R.
Sincere thanks.... And
2009 Jun 22
3
What has happened to the R-Help Google Groups Archive? Alternative?
Greetings,
I usually read this mailing list through google groups
(http://groups.google.com/group/r-help-archive), but when I opened the
webpage this morning it said: "The group named r-help-archive has been
removed because it violated Google's Terms Of Service."
Is there an alternative website which uses a similar structure to
google groups? I had a quick browse on the R Wiki