Gamma Family

λ> (gamma-fn 2.5)
1.329340388179137

λ> (log-gamma-fn 2.5)
0.2846828704729192

λ> (digamma-fn 2.5)
0.7031566378697297

λ> (digamma-fn 2.5)
0.7031566378697297

λ> (trigamma-fn 2.5)
0.4903577561001695

Beta

λ> (beta-fn 2.5 3.6)
0.034686714625592335

λ> (log-beta-fn 2.5 3.6)
-3.36139852915617

Error Functions

λ> (erf 1)
0.8427007929497151

λ> (erf 0.5 1)
0.3222009151366685

λ> (erfc 1)
0.15729920705028488

λ> (inverse-erf 0.8427007929497151)
1.0000000000000004

λ> (inverse-erfc 0.15729920705028488)
1.0000000000000004