[英]Is there a function calculating derivative of digamma function?
I want to calculate the derivative of digamma function in R. 我想计算R中的digamma函数的导数。
R has an existing function called digamma
, but I cannot find a function for the derivative of digamma function. R有一个称为
digamma
的现有函数,但我找不到digamma函数的导数的函数。 Is it possible to write code for differentiated digamma function in R? 是否可以为R中的差分digamma函数编写代码?
Thanks. 谢谢。
Sure, it is called trigamma
当然,这叫做
trigamma
q <- trigamma(3)
There is also psigamma
: psigamma(x, deriv) (deriv >= 0) computes the deriv-th derivative of ψ(x). 还有
psigamma
:psigamma(x,deriv)(deriv> = 0)计算ψ(x)的导数。
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