> From: [EMAIL PROTECTED]
>
> "Liaw, Andy" <[EMAIL PROTECTED]> writes:
>
> > Dear R-help,
> >
> > I am trying to build R-2.2.0-patched (2005-11-07 r36217) on
> the head node of
> > a Scyld cluster (dual Opteron 250s) using PGI compilers
> (v6.0). I used the
> > flags suggested by Jennifer Lai on R-devel (taken from
> R-admin, except that
> > I had to add -L/usr/X11R6/lib64 to LDFLAGS). The build
> went fine, but make
> > check-all failed when running tests/Examples/graphics-Ex.R, at:
> >
> > > plot(1:2, xaxs = "i") # 'inner-axis' w/o extra space
> > > stopifnot(par("xaxp")[1:2] == 1:2 &&
> > + par("usr")[1:2] == 1:2)
> > Error: par("xaxp")]1:2] == 1:2 && par("usr")[1:2] == 1:2 is not TRUE
> >
> > The above looks a bit strange to me, as running the R built
> as above,
> > par("xaxp")[1:2] - 1:2 gives
> >
> > [1] -1.110223e-16 -2.220446e-16
> >
> > Is my R build faulty? I'd very much appreciate any advise.
>
> Relative errors of 1 ULP would not ruin my sleep. It's not obvious to
> me which is the floating point operation responsible for the effect,
> though, and it is a bit suspicious given that it should just be the
> x-range of the data.
It's the par() output that has storage mode "double", as that stores the
coordinates. 1:2 has storage mode "integer".
Those comparisons looked a bit suspicious to me. Isn't it recommended time
and again on this list not to test for exact equality of numerics?
all.equal() of the above does return TRUE.
Andy
> --
> O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B
> c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K
> (*) \(*) -- University of Copenhagen Denmark Ph:
> (+45) 35327918
> ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX:
> (+45) 35327907
>
>
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