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Probabilities.psi Function
Probabilities | Functions
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Returns psi function of x.

Pascal
function psi(derivate: integer; x: double): double;
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Description

Computes the second or third derivate of the logarithm of the gamma function. The function returns NAN, if the x is less than or equal to zero. If derivate parameter is 0, the function returns digamma(x). If the derivate parameter is 1 then the function returns trigamma(x). Other values for derivate parameter are not supported.

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