[R] build on Irix failed reg-tests

[Peter Dalgaard]

Prof Brian Ripley <ripley at stats.ox.ac.uk> writes:

> 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 ....

I get the same as Andy on Opteron, with another curious twist:

> NA-NaN
[1] NA
> NA+NaN
[1] NaN
> NaN+NA
[1] NA
> NaN-NA
[1] NaN

Looks like Thomas is right and we need to fix up the logic of all the
vectorized ops. Drats! 

        -p

> > > #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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> 

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907