[R] crossprod(x) vs crossprod(x,x)

[Robin Hankin]

Hi


On 21 Nov 2006, at 12:27, Duncan Murdoch wrote:

> On 11/21/2006 6:39 AM, Robin Hankin wrote:
>>


[snip]
>>
>> How come my findings are qualitatively different from yours?
>
> Have you said what version of R you're using?  I tried your code in an
> Intel Mac with R 2.4.0, and a Windows machine with R-devel, and saw  
> what
> Brian saw.  Maybe the Power Mac changes this, but that doesn't make a
> lot of sense.  On the other hand, it could be that an older R  
> release is
> making unnecessary copies in one case but not the other.
>
> Duncan Murdoch
>>




Sorry, for some reason I was under the misapprehension that
Sys.info() reported the R version.  Here goes:




 > R.Version()
$platform
[1] "powerpc-apple-darwin8.7.0"

$arch
[1] "powerpc"

$os
[1] "darwin8.7.0"

$system
[1] "powerpc, darwin8.7.0"

$status
[1] ""

$major
[1] "2"

$minor
[1] "4.0"

$year
[1] "2006"

$month
[1] "10"

$day
[1] "03"

$`svn rev`
[1] "39566"

$language
[1] "R"

$version.string
[1] "R version 2.4.0 (2006-10-03)"




--
Robin Hankin
Uncertainty Analyst
National Oceanography Centre, Southampton
European Way, Southampton SO14 3ZH, UK
  tel  023-8059-7743