| igamma {distr} | R Documentation |
Inverse of the digamma function
Description
Function igamma is a numerical inverse of digamma.
Usage
igamma(v)
Arguments
v |
a numeric in the range [-100000,18] |
Details
igamma is vectorized; it is won
by spline inversion of a grid; it works well for range
[digamma(1e-5);digamma(1e8)] or [-100000,18].
Value
igamma(x) is a value u such that digamma(u is approximately x.
Author(s)
Peter Ruckdeschel peter.ruckdeschel@uni-oldenburg.de
See Also
digamma
Examples
igamma(digamma(c(1e-4,1,20,1e8)))
[Package distr version 2.9.3 Index]