[R] build on Irix failed reg-tests

[Liaw, Andy]

Sorry for being dense:  So What is the likely source of the problem, then?
Is it the compiler, the OS, R itself, or some combination of these?  Any
suggestion on how to resolve this?

Best,
Andy

> From: Prof Brian Ripley [mailto:ripley at stats.ox.ac.uk] 
> 
> I think NA+0 should be special, though.  All of mine give
> 
> > NA+NaN
> [1] NA
> > NaN+NA
> [1] NA
> 
> That's with four separate compilers on Sparc-Solaris as well 
> as Windows
> and Linux i686.
> 
> I have long wondered why it works ....
> 
> 
> On Wed, 17 Mar 2004, Liaw, Andy wrote:
> 
> > > From: Thomas Lumley [mailto:tlumley at u.washington.edu] 
> > > 
> > > On Wed, 17 Mar 2004, Liaw, Andy wrote:
> > > 
> > > > Dear R-devel,
> > > >
> > > > Has anyone seen this problem?  We tried building R-1.8.1 
> > > (and R-1.9.0 alpha
> > > > 2004-03-17) on an Irix 6.5 box using
> > > >
> > > > ./configure CC="cc -64" F77="f77 -64" --with-tcltk=no 
> > > --enable-R-shlib
> > > >
> > > > make check failed because NA + 0 gave NaN instead of NA.  
> > > I've tried both
> > > > 32- and 64-bit build, with and without --enable-R-shlib.  
> > > The same symptom
> > > > occur in all cases.
> > > >
> > > 
> > > I haven't seen it before, but it looks to me as though 
> arithmetic.c
> > > assumes that adding a number to a NaN gives the same NaN 
> > > back, (NA is the
> > > NaN with lower word 1954).  That is, we just do
> > > #ifdef IEEE_754
> > >             REAL(ans)[i] = REAL(s1)[i1] + REAL(s2)[i2];
> > > #else
> > > 
> > > This doesn't look as thought it is guaranteed to work, though 
> > > it does on
> > > most machines.  It clearly can't work where both operands 
> are NaN, so
> > > under OS X I get
> > > > NA+NaN
> > > [1] NA
> > > > NaN+NA
> > > [1] NaN
> > > 
> > > 
> > > 	-thomas
> > > 
> > 
> > On our Opteron I get:
> > 
> > > NA+NaN
> > [1] NaN
> > > NaN+NA
> > [1] NA
> > 
> > OK, now I'm really confused...
> > 
> > Andy
> >  
> > 
> > 
> > 
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> > 
> 
> -- 
> 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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