Scilab-Branch-5.3-GIT
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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)
Authors
W. J. Cody (code from Netlib (specfun))
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