Or 4*atan 1. But yes, I agree that there could have been a default
definition.
But omitting it seems reasonable too.
On 10/9/07, Jonathan Cast
On Tue, 2007-10-09 at 13:07 -0700, Don Stewart wrote:
jonathanccast:
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 3.141592653589793
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) ...
jcc
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