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See the recommended documentation of this function
derivative of gammaln function, psi function
y = dlgamma(x)
real vector with same size.
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
|5.4.0||Overloading allowed for list, mlist, tlist and hypermatrix types.|