igamma
From distr v2.6
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(1e5);digamma(1e8)] or [100000,18].
Value

is a value
u
such that digamma(u
is approximately x
.See Also
digamma
Examples
igamma(digamma(c(1e4,1,20,1e8)))
Community examples
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