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igamma

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)

See Also

digamma

Examples

igamma(digamma(c(1e-4,1,20,1e8)))
distr

Object Oriented Implementation of Distributions

v2.8.0
LGPL-3
Authors
Florian Camphausen [ctb] (contributed as student in the initial phase --2005), Matthias Kohl [aut, cph], Peter Ruckdeschel [cre, cph], Thomas Stabla [ctb] (contributed as student in the initial phase --2005), R Core Team [ctb, cph] (for source file ks.c/ routines 'pKS2' and 'pKolmogorov2x')
Initial release
2019-03-11

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