[R] Trigamma function

[Roger Peng]

Yes, the function is called 'trigamma'.  Try

?trigamma

-roger
_______________________________
UCLA Department of Statistics
rpeng at stat.ucla.edu
http://www.stat.ucla.edu/~rpeng

On Wed, 16 Oct 2002, Feng Zhang wrote:

> Hey, all
> 
> Do you how to calculate the trigamma function, that is
> d**2(log(gamma(x))) / dx**2.
> The second-order derivative of log(Gamma(x))?
> 
> I cannot find it in the R package, and somebody knows who or where to get
> such one?
> 
> Thanks.
> 
> Fred
> 
> 
> 
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