SpecFunc_Psi

SpecFunc_Psi(x)

Psi function.

\Psi(x) = \frac{1}{\Gamma(x)}\frac{\mathrm{d} \Gamma(x)}{\mathrm{d}x}

with \Gamma the Gamma function.

Parameters:
x : float \in \Rset^*_+
Returns:
result : float

See also

SpecFunc_Gamma