inv.trigamma | R Documentation |
inv.trigamma
implements the Newton iteration for solving, given
x
, the equation for y
: trigamma(y) = x
.
See appendix of the limma
paper (see "References") for a theoretical
deduction of the method.
inv.trigamma(x, eps = 1e-08)
x |
A positive numeric scalar. |
eps |
The required precision of the solution. |
The solution, which is also a positive numeric scalar.
Smyth, G.K., Linear models and empirical bayes methods for assessing differential expression in microarray experiments. Stat Appl Genet Mol Biol, 2004. 3: p. Article3.
trigamma
for the trigamma function.
x <- trigamma(1:6) vapply(x, inv.trigamma, numeric(1))
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