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dlgamma

derivative of gammaln function, psi function

Syntax

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 :

d(ln(Γ(x))/dx = dΓ(x)/dx . 1/Γ(x)

x must be real. Also known as the psi function.

Examples

dlgamma(0.5)

See also

  • gamma — gamma function, complete or incomplete normalized
  • gammaln — The logarithm of gamma function.

History

VersionDescription
5.4.0 Overloading allowed for list, mlist, tlist and hypermatrix types.
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Last updated:
Mon Nov 07 14:58:54 CET 2022