igamma | R Documentation |
Function igamma
is a numerical inverse of digamma
.
igamma(v)
v |
a numeric in the range [-100000,18] |
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].
igamma(x)
is a value u
such that digamma(u
is approximately x
.
Peter Ruckdeschel peter.ruckdeschel@uni-oldenburg.de
digamma
igamma(digamma(c(1e-4,1,20,1e8)))
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