Name
dlgamma — derivative of gammaln function, psi function
Calling Sequence
y = dlgamma(x)
Parameters
- x
real vector
- y
real vector with same size.
Description
dlgamma(x) evaluates, at all the elements of
x the logarithmic derivative of the gamma function
which corresponds also to the derivative of the gammaln function :
x must be real. Also known as the psi
function.
Authors
W. J. Cody (code from Netlib (specfun))
