[R] Trigamma function
Bill.Venables@cmis.csiro.au
Bill.Venables at cmis.csiro.au
Thu Oct 17 05:26:21 CEST 2002
Feng Zhang asks:
> -----Original Message-----
> From: Feng Zhang [mailto:f0z6305 at labs.tamu.edu]
> Sent: Thursday, October 17, 2002 11:28 AM
> To: R-Help
> Subject: [R] Trigamma function
>
> 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?
[WNV] Eh? Try package:base. Hard to avoid really.
> find(trigamma)
[1] "package:base"
> trigamma(1:10)
[1] 1.6449341 0.6449341 0.3949341 0.2838230 0.2213230 0.1813230
0.1535452
[8] 0.1331370 0.1175120 0.1051663
>
Easy peasy.
> Thanks.
>
> Fred
>
>
>
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