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Digamma (psi) function for value objects

digamma.value.Rd

Computes the digamma function psi(x) = d/dx log(gamma(x)). This is the derivative of lgamma and appears in gradients of many statistical distributions.

Usage

# S3 method for class 'value'
digamma(x)

Arguments

x

A value object

Value

A new value object representing digamma(x)