Subject: Re: [boost] GGL Review
From: Jonathan Franklin (franklin.jonathan_at_[hidden])
Date: 2009-11-17 12:47:24
On Tue, Nov 17, 2009 at 10:23 AM, Phil Endecott
> Do please have a look at the paper that I linked to before, and in
> particular the figure at the top of the second page:
I have read this, and several other papers. I've even taken a few
numerical analysis classes at the university.
> 1. Failures may not occur only in cases when things are very close. A
> problematic input may cause the output to be grossly wrong.
Lady luck has smiled on me thus far.
And a small amount of data pre-processing goes a *long* way. Know
your algorithms, and their pre/post-conditions.
> 2. You may not get a wrong answer; the program might instead segfault or
> loop forever.
This is not a FP-induced instability problem. This is a bug in your
algorithm. Coincidentally, I just fixed a loop-forever bug in one of
our geometry algorithms the other day.
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