[R-sig-Debian] make check reg-tests-1b.R fails with Ubuntu R

[Michael Rutter]

On 09/14/2011 10:45 AM, Dirk Eddelbuettel wrote:
>
> Andrew,
>
> Crossprod etc all dispatch to BLAS / LAPACK.  The error appears to be that
> z[1,3] is 0 whereas a NA gets expected.
>
> I just verified this on another 32bit box where I had stock R and little
> else:
>
>> x<- matrix(c(1, 0, NA, 1), 2, 2) ; y<- matrix(c(1, 0, 0, 2, 1, 0), 3, 2)
>> (z<- tcrossprod(x, y))
>       [,1] [,2] [,3]
> [1,]   NA   NA    0
> [2,]    2    1    0
>>   identical(z, x %*% t(y))
> [1] FALSE
>>
>
> but all it takes is
>
> wajig install libatlas3gf-base
>
> after which we get
>
> dd at chibud:~$ R
>
> R version 2.13.1 (2011-07-08)
> Copyright (C) 2011 The R Foundation for Statistical Computing
> ISBN 3-900051-07-0
> Platform: i686-pc-linux-gnu (32-bit)
>
> R is free software and comes with ABSOLUTELY NO WARRANTY.
> You are welcome to redistribute it under certain conditions.
> Type 'license()' or 'licence()' for distribution details.
>
>    Natural language support but running in an English locale
>
> R is a collaborative project with many contributors.
> Type 'contributors()' for more information and
> 'citation()' on how to cite R or R packages in publications.
>
> Type 'demo()' for some demos, 'help()' for on-line help, or
> 'help.start()' for an HTML browser interface to help.
> Type 'q()' to quit R.
>
>>   x<- matrix(c(1, 0, NA, 1), 2, 2) ; y<- matrix(c(1, 0, 0, 2, 1, 0), 3, 2)
>> (z<- tcrossprod(x, y))
>       [,1] [,2] [,3]
> [1,]   NA   NA   NA
> [2,]    2    1    0
>>   identical(z, x %*% t(y))
> [1] TRUE
>>
>
>
> So try installing 'a better BLAS'.  Maybe we can distill this into a pure C
> program exhibiting the same issue and bring it to the BLAS maintainer?
>
> Dirk
>
>

If I had just waited three more minutes for Dirk to reply, the email I 
sent before would not be  incorrect.  I thought I was working on a stock 
machine, but I had installed libatlas3gf-base myself at some point, so I 
am getting the same results as Dirk.  Please ignore that email.

Sorry about the misdiagnosis,
Michael

-- 
Dr. Michael A. Rutter
School of Science
Penn State Erie, The Behrend College
Station Road
Erie, PA 16563
http://math.bd.psu.edu/faculty/rutter