Trigamma function, the second derivative of lgamma. Equivalent to R's trigamma(). Takes a single number.
lgamma
trigamma()
trigamma(-Infinity) is Infinity as in R (NaN with rCompatible: false).
trigamma(-Infinity)
Infinity
NaN
rCompatible: false
Argument.
Optional
rCompatible (default true).
rCompatible
true
psi'(x) (Infinity at zero and the negative integers).
trigamma(1); // 1.6449340668482264 (pi^2 / 6) Copy
trigamma(1); // 1.6449340668482264 (pi^2 / 6)
Trigamma function, the second derivative of
lgamma. Equivalent to R'strigamma(). Takes a single number.trigamma(-Infinity)isInfinityas in R (NaNwithrCompatible: false).