Martin Maechler brought this up a while back (and added the regression test). I believe it was a compiler problem and upgrading to gcc 3.4.1 fixed it.

See the thread starting here:

https://stat.ethz.ch/pipermail/r-devel/2004-July/030260.html

-roger

Liaw, Andy wrote:
Hi all,

I've only now noticed that on our Opteron boxes running Suse Enterprise
Server 8 that R-2.0.1 did not pass make chek-all.  It bombed in
tests/lapack.R at:


eigenok <- function(A, E, Eps = 1000 * .Machine$double.eps) {

V <- E$vect
lam <- E$values
stopifnot(abs(A %*% V - V %*% diag(lam)) < Eps, .... [TRUNCATED]



Ceigenok <- function(A, E, Eps = 1000 * .Machine$double.eps) {

V <- E$vect
lam <- E$values
stopifnot(Mod(A %*% V - V %*% diag(lam)) < Eps, .... [TRUNCATED]



sm <- cbind(1, 3:1, 1:3)


eigenok(sm, eigen(sm))

Error: abs(A %*% V - V %*% diag(lam)) < Eps is not TRUE

This is using:
~/R-2.0.1> gcc -v
Reading specs from /opt/gcc33/lib64/gcc-lib/x86_64-suse-linux/3.3/specs
Configured with: ../configure --enable-threads=posix --prefix=/opt/gcc33
--with-local-prefix=/usr/local --infodir=/opt/gcc33/share/info
--mandir=/opt/gcc33/share/man --libdir=/opt/gcc33/lib64
--enable-languages=c,c++,f77,objc,java,ada --disable-checking
--enable-libgcj --with-gxx-include-dir=/opt/gcc33/include/g++
--with-slibdir=/lib64 --with-system-zlib --enable-shared
--enable-__cxa_atexit x86_64-suse-linux
Thread model: posix
gcc version 3.3 20030312 (prerelease) (SuSE Linux)

compiled with the following setting:

R is now configured for x86_64-unknown-linux-gnu

  Source directory:          .
  Installation directory:    /usr/local

  C compiler:                gcc  -g -O2
  C++ compiler:              g++  -g -O2
  Fortran compiler:          g77  -g -O2

  Interfaces supported:      X11, tcltk
  External libraries:        readline
  Additional capabilities:   PNG, JPEG
  Options enabled:           R profiling

  Recommended packages:      yes

Actually, I've only noticed this when the samething happens on a RH-based
box (same hardware), using:
$ gcc -v
Reading specs from /usr/lib/gcc-lib/x86_64-redhat-linux/3.2.3/specs
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --enable-shared --enable-threads=posix
--disable-checking --with-system-zlib --enable-__cxa_atexit
--enable-languages=c,c++,objc,java,f77 --host=x86_64-redhat-linux
Thread model: posix
gcc version 3.2.3 20030502 (Red Hat Linux 3.2.3-24)

I'd very much appreciate any pointers!

Best,
Andy


Andy Liaw, PhD
Biometrics Research PO Box 2000, RY33-300 Merck Research Labs Rahway, NJ 07065
andy_liaw <at> merck.com 732-594-0820


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