gammaln

Arguments

x

real vector

y

real vector with same size.

Description

gammaln(x) evaluates the logarithm of gamma function at all the elements of x, avoiding underflow and overflow. x must be real.

Examples

gammaln(0.5)

See Also

• gamma — The gamma function.
• dlgamma — derivative of gammaln function, psi function

Authors

W. J. Cody and L. Stoltz (code from Netlib (specfun))