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Cdigamma
Complex digamma function of a complex argument.
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Loading LOADSUB ALL FROM "CDIGAMMA.HTS"
or LOADSUB FROM "MATHLIB.HTS"
Usage COMPLEX Z,C
C=Cdigamma(Z)
Description
FNCdigamma returns the value of the digamma function (sometimes called the psi function) of the complex value z, Ψ(z). The value of Ψ(z) approaches ± as z approaches a real negative integer value or zero.
Errors
FNCdigamma causes an HTBasic error if its argument is not of type COMPLEX or if the magnitude of either the real or imaginary component of Ψ(z) exceeds MAXREAL, the largest number representable.
See Also
Cgamma, Digamma
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