Trigamma function
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.
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