xerbla called from BLAS routine (PR#8100)

On Mon, Aug 29, 2005 at 10:06:00AM +0200, ripley at stats.ox.ac.uk wrote:
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I don't believe your message actually came from R's XERBLA.  Note that the=
=20
name is not quoted and that the name of the routine is not 6 characters=20
long.
Actually, it did.
You seem to be agreeing that it did not (which is the truth).
I didn't quote the message exactly (as I said).
You didn't say, and the posting guide does ask you to do so exactly.
Now, I took the liberty to make my own suggested change in 
R-devel_2005-08-28 and rebuilt, and you may guess what error message I 
got.;)

Error in coxreg.fit(X, Y, rs, strats, offset, init, max.survs, method,  :
       The BLAS/LAPACK routine 'DSYR  ' gave error code -7

BTW, the original BLAS xerbla (from the netlib page you referred to)
gives the message:

    WRITE( *, FMT = 9999 )SRNAME, INFO
9999 FORMAT( ' ** On entry to ', A6, ' parameter number ', I2, ' had ',
    $      'an illegal value' )

which I think is even better than my original suggestion.
(Why was it changed?)
Probably because R is not a Fortran program and so needs to make clear 
what these refer to, and because LAPACK does have other error values that 
invalid parameter values.
G?ran

Here is a genuine example from R:

Error in La.svd(x, nu, nv) : LAPACK routine 'DGEBRD' gave error code -10

There is no R 2.2.0, BTW.  If referring to R-devel, please do so with an=20
SVN revision.

On Sun, 28 Aug 2005 gb at stat.umu.se wrote:

Full_Name: G=F6ran Brostr=F6m
Version: R-2.1.1, 2.2.0
OS: Debian unstable
Submission from: (NULL) (213.65.9.59)

Some BLAS routines call xerbla for error messages, which results in a mes=
sage
like
"LAPACK routine DGER gave error code -9".

Suggested solution: In

void F77_NAME(xerbla)(char *srname, int *info)
{
  /* srname is not null-terminated.  It should be 6 characters. */
   char buf[7];
   strncpy(buf, srname, 6);
   buf[6] =3D '\0';
   error(_("LAPACK routine '%6s' gave error code %d"), buf, -(*info));
}

change 'LAPACK' to 'The' (or 'The BLAS/LAPACK').

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--=20
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595
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______________________________________________
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-- 
G?ran Brostr?m                    tel: +46 90 786 5223
Professor and Head
Department of Statistics          fax: +46 90 786 6614
Ume? University                   http://www.stat.umu.se/~goran.brostrom/
SE-90187 Ume?, Sweden             e-mail: gb at stat.umu.se

Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

xerbla called from BLAS routine (PR#8100)

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