1 #ifndef STAN_MATH_REV_SCAL_FUN_LOG_RISING_FACTORIAL_HPP 2 #define STAN_MATH_REV_SCAL_FUN_LOG_RISING_FACTORIAL_HPP 14 class log_rising_factorial_vv_vari :
public op_vv_vari {
16 log_rising_factorial_vv_vari(vari* avi, vari* bvi) :
21 avi_->adj_ += adj_ * (
digamma(avi_->val_ + bvi_->val_)
23 bvi_->adj_ += adj_ *
digamma(avi_->val_ + bvi_->val_);
27 class log_rising_factorial_vd_vari :
public op_vd_vari {
29 log_rising_factorial_vd_vari(vari* avi,
double b) :
33 avi_->adj_ += adj_ * (
digamma(avi_->val_ + bd_)
38 class log_rising_factorial_dv_vari :
public op_dv_vari {
40 log_rising_factorial_dv_vari(
double a, vari* bvi) :
44 bvi_->adj_ += adj_ *
digamma(bvi_->val_ + ad_);
51 return var(
new log_rising_factorial_vd_vari(a.
vi_, b));
56 return var(
new log_rising_factorial_vv_vari(a.
vi_, b.
vi_));
61 return var(
new log_rising_factorial_dv_vari(a, b.
vi_));
Independent (input) and dependent (output) variables for gradients.
vari * vi_
Pointer to the implementation of this variable.
fvar< T > log_rising_factorial(const fvar< T > &x, const fvar< T > &n)
fvar< T > digamma(const fvar< T > &x)
Return the derivative of the log gamma function at the specified argument.