Module rgsl::psi [−][src]
Expand description
The polygamma functions of order n are defined by
\psi^{(n)}(x) = (d/dx)^n \psi(x) = (d/dx)^{n+1} \log(\Gamma(x))
where \psi(x) = \Gamma’(x)/\Gamma(x) is known as the digamma function.
Modules
diagamma | |
polygamma | |
trigamma |