Hi ! I have installed R-2.7.0 64-bits on a computer where the new Ubuntu version (8.04) was installed. This computer is a 3.2 GHz Dual-core with 2 Gb of RAM.
To test how fast (I though !) this machine is, I compared two simple matrix manipulations between Ubuntu and my laptop (a MacBook Pro 2.2 GHz with also 2 Gb of RAM under Mac OS X 10.5.2). By the way, I install the normal version of R on my MacBook Pro (32-bits) I decided to use the following matrix manipulation because they are typical manipulation that I was planning to do repetitively and with much larger matrices for my PhD project. First matrix manipulation: coco<-matrix(rnorm(1000000),1000,1000) system.time(coco2<-eigen(coco)) Results on the Mac: user system elapsed 7.301 0.974 7.376 Results on Ubuntu: user system elapsed 20.573 0.088 20.766 Second matrix manipulation: coco<-matrix(rnorm(1000000),1000,1000) system.time(coco3<-coco%*%coco) Results on the Mac: user system elapsed 0.360 0.024 0.224 Results on Ubuntu: user system elapsed 2.756 0.000 2.758 If I understand these results right, my MacBook Pro is far better than this Desk computer. I know Macs are good but that difference of performance is surprising me, did I do something wrong considering the large difference in processor? Thanks in advance Guillaume Blanchet ______________________________________________ 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.
