Error and Gamma Functions(IM:PN)

Inside Macintosh: PowerPC Numerics / Part 2 - The PowerPC Numerics C Implementation: Chapter 10 - Transcendental Functions

Error and Gamma Functions
MathLib provides four error and gamma functions:
$erf(x)$ Error function
$erfc(x)$ Complementary error function
$gamma(x)$ Computes (x)
$lgamma(x)$ Computes the natural logarithm of the absolute value of gamma(x)

$erf(x)$	Error function
$erfc(x)$	Complementary error function
$gamma(x)$	Computes (x)
$lgamma(x)$	Computes the natural logarithm of the absolute value of gamma(x)