dlgamma

derivative of gammaln function, psi function

Calling Sequence

y = dlgamma(x)

Arguments

: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.

Examples

dlgamma(0.5)

See Also

• `gamma`_ The gamma function.
• `gammaln`_ The logarithm of gamma function.

History

Version Description 5.4.0 Overloading allowed for list, mlist, tlist and hypermatrix types. .. _gamma: gamma.html .. _gammaln: gammaln.html