Special matematical functions related to the multivariate gamma function which appears in the Wishart and Inverse Wishart distributions. The interface and usage should mirror the Special mathematical functions from the base package.
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A numeric vector of values. The values of
A (single) integer giving the dimension. Default is
A (single) integer giving the order of the derivative.
Warnings are thown when the functions are evaluated outside its domain.
Bmisc:::plotMultivariateSpecial() for more info.
Returns a numeric vector with the same length as
gamma and related functions
returned with warning when the function is evaluated outside its domain
gammap is the multivariate gamma function.
digammap is the multivariate digamma function.
Dgammap is the derivative of the multivariate gamma function.
psigammap is the n'th derivative log multivariate
gamma function (i.e. multivariate polygamma).
trigammap is the 2'nd derivative log multivariate
gamma function (i.e. the multivariate trigamma).
lgammap is the log multivariate gamma function.
lgammp, warnings of the type
"value out of range in
'lgamma'" is due to evaluation in the half integers below (p-1)/2.
Anders Ellern Bilgrau <anders.ellern.bilgrau (at) gmail.com>
The Special mathematical functions.
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