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distr (version 2.7.0)

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]

Value

igamma(x) is a value u such that digamma(u is approximately x.

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].

See Also

digamma

Examples

Run this code
# NOT RUN {
igamma(digamma(c(1e-4,1,20,1e8)))
# }

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