Inverse Trigamma Function
The inverse of the trigamma function.
trigammaInverse(x)
x |
numeric vector or array |
The function uses Newton's method with a clever starting value to ensure monotonic convergence.
Numeric vector or array y satisfying trigamma(y)==x.
This function does not accept a data.frame as argument although the base package function trigamma does.
Gordon Smyth
This function is the inverse of trigamma in the base package.
This function is called by fitFDist.
y <- trigammaInverse(5) trigamma(y)
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