Dew Math for .NET
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Returns trigamma function or psi(1,x)
Computes the second derivate of the logarithm of the gamma function. The function returns NAN, if the x is less than or equal to zero.
The algorithm was adapted from:
The algorithm "AS 121" from "Applied Statistics" (1978) vol 27, no. 1 Available in Fortran at: http://lib.stat.cmu.edu/apstat/121
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