Adrian Kubala wrote:
> [...]
> Main> norm (b, a) * norm (b, c)
> 2.0
Well, mathematically this is 2, but not in Real-World-Floating-Point(tm) :-).
> Main> asin (-2 / (norm (b, a) * norm (b, c)))
Again, in theory this is well defined: asin (-1) = -pi/2, but you actually
don't pass -1, but something slightly smaller, so asin is undefined. See:
http://docs.sun.com/htmlcoll/coll.648.2/iso-8859-1/NUMCOMPGD/ncg_goldberg.html
Also note that "normal" Hugs versions only fake Double by using Float. So Hugs'
behaviour is correct here...
Cheers,
S.
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