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Fix multiple problems in Erf and InvErf methods #57

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merged 1 commit into from Jun 5, 2016
Merged

Fix multiple problems in Erf and InvErf methods #57

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8 changes: 4 additions & 4 deletions include/instances.h
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Expand Up @@ -97,9 +97,9 @@ instance BODY1(RealFrac a) => RealFrac (HEAD) where
instance BODY1(Erf a) => Erf (HEAD) where
erf = lift1 erf $ \x -> (2 / sqrt pi) * exp (negate x * x)
erfc = lift1 erfc $ \x -> ((-2) / sqrt pi) * exp (negate x * x)
normcdf = lift1 normcdf $ \x -> ((-1) / sqrt pi) * exp (x * x * fromRational (- recip 2) / sqrt (2))
normcdf = lift1 normcdf $ \x -> (recip $ sqrt (2 * pi)) * exp (- x * x / 2)

instance BODY1(InvErf a) => InvErf (HEAD) where
inverf = lift1 inverfc $ \x -> recip $ (2 / sqrt pi) * exp (negate x * x)
inverfc = lift1 inverfc $ \x -> recip $ negate (2 / sqrt pi) * exp (negate x * x)
invnormcdf = lift1 invnormcdf $ \x -> recip $ ((-1) / sqrt pi) * exp (x * x * fromRational (- recip 2) / sqrt 2)
inverf = lift1_ inverf $ \x _ -> sqrt pi / 2 * exp (x * x)
inverfc = lift1_ inverfc $ \x _ -> negate (sqrt pi / 2) * exp (x * x)
invnormcdf = lift1_ invnormcdf $ \x _ -> sqrt (2 * pi) * exp (x * x / 2)