jonathanccast at fastmail.fm
Tue Oct 9 17:52:57 EDT 2007
On Tue, 2007-10-09 at 13:07 -0700, Don Stewart wrote:
> > I just noticed that pi doesn't have a default definition in the standard
> > prelude, according to the Haddock docs. Why is this?
> $ ghci
> Prelude> :t pi
> pi :: (Floating a) => a
> Prelude> pi
> It's in the Floating class.
Yes. But it doesn't have a default implementation. That strikes me as
odd, considering the mathematical and actual correctness of
class Floating sigma where
pi = acos (-1)
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