(1) -> NV(x:Float):Float == (1+erf(x/sqrt(2)))/2
Function declaration NV : Float -> Float has been added to
workspace.
Type: Void
(2) -> NV(0.7)
Compiling function NV with type Float -> Float
(2) 0.7580363477_7692698525
Type: Float
Or is your point that this should not be necessary?
On 22 October 2015 at 13:26, Prof. Dr. Johannes Grabmeier privat
<[email protected]> wrote:
> another problem with numeric evaluations for computing the normal
> distribution using the error function.
> To my opinion, numeric NV(0.7) directly should return 0.7580363478
>
>
>
> Type:
> Float
> (52) -> NV(x) == (1+erf(x/sqrt(2)))/2
> Compiled code for NV has been cleared.
> 1 old definition(s) deleted for function or rule NV
> Type:
> Void
> (53) -> numeric NV(0.7)
> Compiling function NV with type Float -> Expression(Float)
>
> >> Error detected within library code:
> Can only compute the numerical value of a constant, real-valued
> Expression
>
> (53) -> NV(0.7)
>
> (53) 0.5 erf(0.4949747468) + 0.5
> Type:
> Expression(Float)
> (54) -> numeric NV(0.7)
>
> >> Error detected within library code:
> Can only compute the numerical value of a constant, real-valued
> Expression
>
> (54) -> erf(0.4949747468)
>
> (54) 0.5160726955_315973
>
> (55) -> 0.5*erf(0.4949747468)+0.5
>
> (55) 0.7580363478
> Type:
> Float
>> --
>> Mit freundlichen Grüßen
>>
>> Johannes Grabmeier
>>
>> Prof. Dr. Johannes Grabmeier
>> Köckstraße 1, D-94469 Deggendorf
>> Tel. +49-(0)-991-2979584, Tel. +49-(0)-151-681-70756
>> Tel. +49-(0)-991-3615-141 (d), Fax: +49-(0)-3224-192688
>
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