My bad..

these are the real matrices

> G<-DiagonalGaussian( NumberOfImagePixels,sd=Gsd)
> str(G)
 num [1:16384, 1:16384] 1400 0 0 0 0 ...
> S<-PointSamplingMatrix(EffectiveSensors,NumberOfImagePixels)
> str(S)
 num [1:10650, 1:16384] 0 0 0 0 0 0 0 0 0 0 ...
> A<-S %*% G





________________________________
 From: R. Michael Weylandt <michael.weylandt@gmail.com>

Cc: Paul Hiemstra <paul.hiemstra@knmi.nl>; "R-help@r-project.org" <R-help@r-project.org> 
Sent: Monday, February 6, 2012 3:39 PM
Subject: Re: [R] R enterprise for linux

Are you sure?

I just ran

N <- 128
system.time(matrix(rnorm(N^2),N) %*% matrix(rnorm(N^2),N))

and it took less than 0.044s on my (old-ish) laptop while doing other
things (and that includes the expensive rng calls). There might be
some other issues in play here. Even N <- 1280 takes < 5 seconds with
the rng call.

Michael


> Actually, I would like to speed up matrix multiplication
>
> which is really too slow.
> MatrixA %*% MatrixB (each one is a [128,128] table) is running four hours now... and just imagine that I want to calculate many of those.
>
> Which other alternative do I have?
>
> Regards
> Alex
>
>
> ________________________________
>  From: Paul Hiemstra <paul.hiemstra@knmi.nl>
>
> Cc: "R-help@r-project.org" <R-help@r-project.org>
> Sent: Monday, February 6, 2012 2:30 PM
> Subject: Re: [R] R enterprise for linux
>
>
> Dear Alex,
>
> By Enterprise R, do you mean Revolution R? I can also only find red
>    hat packages. You could send them an e-mail to ask for sources. They
>    probably want to help you, especially when you pay. But why do you
>    need RevoR and not standard R.
>
> Paul
>
> On 02/06/2012 12:55 PM, Alaios wrote:
> Dear all,
> I would like to ask you if it would be possible  to install R enterprise in opensuse.
> Actually it seems that there are only Red Hat packages and I was wondering if their source code is available so one to try and compile it. I would like to thank you in advance for your reply Regards
> Alex [[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.
>
>
> --
> Paul Hiemstra, Ph.D.
> Global Climate Division
> Royal Netherlands Meteorological Institute (KNMI)
> Wilhelminalaan 10 | 3732 GK | De Bilt | Kamer B 3.39
> P.O. Box 201 | 3730 AE | De Bilt
> tel: +31 30 2206 494 http://intamap.geo.uu.nl/~paul
> http://nl.linkedin.com/pub/paul-hiemstra/20/30b/770
>        [[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.
>
	[[alternative HTML version deleted]]

