Stan Math Library
4.9.0
Automatic Differentiation
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double stan::math::opencl_kernels::lgamma_stirling | ( | double | x | ) |
Return the Stirling approximation to the lgamma function.
\[ \mbox{lgamma_stirling}(x) = \frac{1}{2} \log(2\pi) + (x-\frac{1}{2})*\log(x) - x \]
x | value |
Definition at line 30 of file lgamma_stirling.hpp.