[Rd] Optimization bug when byte compiling with gcc 5.3.0 on windows

[William Dunlap]

>If I recall correctly, some eigen vectors had their
>direction flipped (negative values became positive and vice versa).
>Did you notice anything of this kind when running 'make check' and
>'make check recommended' ? It is important to us that numeric results
>are reproducible between versions of R.

I think that any code that depends on the direction
of an eigenvector should be considered broken.
It is too bad that eigen's output does not have a class
so that an all.equal method that know that the vector
direction is not relevant could be written for it


Bill Dunlap
TIBCO Software
wdunlap tibco.com

On Mon, Apr 4, 2016 at 11:39 AM, Jeroen Ooms <jeroen.ooms at stat.ucla.edu>
wrote:

> On Sun, Apr 3, 2016 at 6:44 PM, Ray Donnelly <rdonnelly at continuum.io>
> wrote:
> > I've started to look into building R for Windows using MSYS2 as both the
> > build environment and tools + libraries provider (where possible).
>
> Thanks for your reply, and for the patches.
>
> Last time I had a look at this (a few months ago) another problem was
> that mingw-w64 v4 was giving different numeric output for some of the
> tests in r-base. If I recall correctly, some eigen vectors had their
> direction flipped (negative values became positive and vice versa).
> Did you notice anything of this kind when running 'make check' and
> 'make check recommended' ? It is important to us that numeric results
> are reproducible between versions of R.
>
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>

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