On 2020-05-09 11:40 -0400, J C Nash wrote:
>
> > solve(D)
> [,1] [,2]
> [1,] -2.0 1.0
> [2,] 1.5 -0.5
> > D %*% solve(D)
> [,1] [,2]
> [1,] 1 1.110223e-16
> [2,] 0 1.000000e+00
> >
Dear list,
I get another solution on my Linux i7-7500U
laptop, but the same solution on my FreeBSD
E3-1240Lv5 machine with a really old R
version (without BLAS) ...
How is this possible?
> D %*% solve(D)
[,1] [,2]
[1,] 1.000000e+00 0
[2,] 8.881784e-16 1
> sessionInfo()
R version 3.6.3 (2020-02-29)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Arch Linux
Matrix products: default
BLAS: /usr/lib/libopenblasp-r0.3.9.so
LAPACK: /usr/lib/liblapack.so.3.9.0
locale:
[1] LC_CTYPE=en_GB.UTF-8 LC_NUMERIC=C
[3] LC_TIME=en_DK.UTF-8 LC_COLLATE=en_GB.UTF-8
[5] LC_MONETARY=nb_NO.UTF-8 LC_MESSAGES=en_GB.UTF-8
[7] LC_PAPER=nb_NO.UTF-8 LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
[11] LC_MEASUREMENT=nb_NO.UTF-8 LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
loaded via a namespace (and not attached):
[1] compiler_3.6.3
>
>From the machine running FreeBSD:
> D %*% solve(D)
[,1] [,2]
[1,] 1 1.110223e-16
[2,] 0 1.000000e+00
> sessionInfo()
R version 3.5.2 (2018-12-20)
Platform: amd64-portbld-freebsd12.0 (64-bit)
Running under: FreeBSD hmm 12.0-RELEASE FreeBSD 12.0-RELEASE r341666 GENERIC
amd64
Matrix products: default
LAPACK: /usr/local/lib/R/lib/libRlapack.so
locale:
[1] C/en_GB.UTF-8/en_GB.UTF-8/C/en_GB.UTF-8/en_GB.UTF-8
attached base packages:
[1] stats graphics grDevices utils datasets methods base
loaded via a namespace (and not attached):
[1] compiler_3.5.2
>
Best,
Rasmus
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