Re: [office-formula] GAMMA constraint

["Andreas J. Guelzow" <aguelzow@math.concordia.ab.ca>]

On Wed, 2008-04-16 at 14:06 +0200, Eike Rathke wrote:
> Hi,
> 
> I got the following comment on the GAMMA definition:
> 
> | in ODF 6.15.31 I find
> | "Syntax: GAMMA( Number N )
> | Constraints: N >= 0"
> | 
> | I think the constraint is wrong.
> | GAMMA(0) is not defined.
> | 
> | But there is no need for N>0. The gamma function is defined for negative
> | numbers too, besides the singularities for non-positive integers.
> | 
> | Therefore the constraint should be
> | N in setR setminus setZ sup{""<=0}
> | (use OOo Math to see the formula)
> 
> 
> I'll change that accordingly if there are no objections. AFAIK none of
> the "usual" spreadsheet applications does implement GAMMA so far, so we
> won't have to keep a Portable Constraint N>=0, or should we?

I see no point to keep such a "portability constraint" if there are no
existing implementations. In any case, N=0 is not an allowed value, so
such a constraint would need to be N>0. (But as I said above, I see no
point in such a constraint.)

Andreas