[ChangeSet] Beta function...

[David Bateman]

John W. Eaton wrote:
> On 18-Mar-2008, David Bateman wrote:
> | The attached version might be better as the reason I used the function
> | name xclgamma was that I was trying to have a function like
> | 
> | extern Complex xclgamma (double);
> | 
> | but that is not possible to use within the current mapper
> | framework..
> 

<snip proposed change>

> What do you think?  Is this change worth making?

Frankly I think the overhead of converting to a complex argument and
then back to a real argument for the few cases that need this is minimal
compared to the cost of calling the mapper function itself, and so there
will probably be little to gain by this in terms of performance. The
only reason I can see to do it is if you consider it a cleaner
implementation, which it arguably might be.

> Also, it would be good to have the same mechanism working in the
> Sparse classes.  If you don't have time, I could take a look at it and
> propose a patch if you could review it.

I'm not sure its worth the effort, and I'd propose just to use the
lgamma patch as is.

D.