From duncan@research.bell-labs.com  Tue Jul 17 13:13:59 2001
From: duncan@research.bell-labs.com (Duncan Temple Lang)
Date: Tue, 17 Jul 2001 08:13:59 -0400
Subject: [Rd] cmdscale in package mva (PR#1027)
In-Reply-To: <200107171202.OAA19478@pubhealth.ku.dk>; from ripley@stats.ox.ac.uk on Tue, Jul 17, 2001 at 02:02:12PM +0200
References: <200107171202.OAA19478@pubhealth.ku.dk>
Message-ID: <20010717081359.D27049@jessie.research.bell-labs.com>


For what it is worth, I saw this problem a few weeks ago but didn't
have time to investigate it in depth and managed to find a work
around.  It arose for me on Solaris, specifically when I was compiling
with the native C compiler cc and f77.  Switching to gcc and f77
removed the problem.  (There is a possibility that I have this
backwards, but I think my memory is correct on this point.)

D.


ripley@stats.ox.ac.uk wrote:
> On Tue, 17 Jul 2001, Kurt Hornik wrote:
> 
> > >>>>> laurent  writes:
> >
> > > Full_Name: Laurent Gautier
> > > Version: 1.3.0-patched
> > > OS: IRIX 6.5
> > > Submission from: (NULL) (130.225.67.199)
> >
> >
> > > Hello,
> >
> > > The function La.eigen, called by cmdscale in the package mva behaves
> > > an unexplicable way (for me).
> >
> > > The following lines show what happened.  I tried the very same on
> > > linux, and it worked fine.
> >
> > >> a <- matrix(c(1,2,3,2),3,3)
> > >> a
> > >      [,1] [,2] [,3]
> > > [1,]    1    2    3
> > > [2,]    2    1    2
> > > [3,]    3    2    1
> > >> library(mva)
> > >> cmdscale(a)
> > > Error in La.eigen(Tmat, symmetric = TRUE) :
> > > 	On entry to DSYEV  parameter number 8 had an illegal value
> >
> > I can confirm this on Naras's IRIX machine (in fact, was just about to
> > report this myself ...)
> 
> Can you put a breakpoint at line 72 of Lapack.c and see what value of lwork
> is returned?  Alternatively, it may fail on the first dsyev call, in which
> case I would guess that the wrong LAPACK routine is being found (and that's
> a plausible explanation).
> 
> I get 102 with the built-in BLAS: the answer should be at least max(1, 3*n-1)
> 
> What BLAS is in use?  The intention is that the workspace is chosen large
> enough to allow the BLAS to work efficiently: it might just be that
> the BLAS is reporting erroneously.
> 
> -- 
> Brian D. Ripley,                  ripley@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 272860 (secr)
> Oxford OX1 3TG, UK                Fax:  +44 1865 272595
> 
> 
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-- 
_______________________________________________________________

Duncan Temple Lang                duncan@research.bell-labs.com
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[Rd] cmdscale in package mva (PR#1027)
Duncan Temple Lang