igamma
From distr v2.8.0
by Peter Ruckdeschel
Inverse of the digamma function
Function igamma is a numerical inverse of digamma.
- Keywords
- math
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.
See Also
digamma
Examples
# NOT RUN {
igamma(digamma(c(1e-4,1,20,1e8)))
# }
Community examples
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