(**) default implementation is incorrect for negative values

ekmett / intervals

Interval Arithmetic

http://hackage.haskell.org/package/intervals

BSD 2-Clause "Simplified" License

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Open alex-rozenshteyn-leapyear opened 7 years ago

alex-rozenshteyn-leapyear commented 7 years ago

> let x = (-2) in x ** x
0.25

> import Numeric.Interval.NonEmpty
> let x = (-2) ... (-2) in x ** x
Infinity ... Infinity

ekmett commented 7 years ago

Woops.

massma commented 4 years ago

Another example, but with slightly different behavior:

> ((-1.0) ... (-0.5)) ** 2.0
Empty

I'll try and poke around and zero in on the problem if I can find the time.

amigalemming commented 3 years ago

You are using the wrong power function. You must use (^^) instead.