1 #ifndef STAN_MATH_REV_SCAL_FUN_LOG_DIFF_EXP_HPP 2 #define STAN_MATH_REV_SCAL_FUN_LOG_DIFF_EXP_HPP 13 class log_diff_exp_vv_vari :
public op_vv_vari {
15 log_diff_exp_vv_vari(vari* avi, vari* bvi) :
16 op_vv_vari(
log_diff_exp(avi->val_, bvi->val_), avi, bvi) {
20 bvi_->adj_ -= adj_ /
expm1(avi_->val_ - bvi_->val_);
23 class log_diff_exp_vd_vari :
public op_vd_vari {
25 log_diff_exp_vd_vari(vari* avi,
double b) :
32 class log_diff_exp_dv_vari :
public op_dv_vari {
34 log_diff_exp_dv_vari(
double a, vari* bvi) :
38 bvi_->adj_ -= adj_ /
expm1(ad_ - bvi_->val_);
51 return var(
new log_diff_exp_vv_vari(a.
vi_, b.
vi_));
62 return var(
new log_diff_exp_vd_vari(a.
vi_, b));
73 return var(
new log_diff_exp_dv_vari(a, b.
vi_));
Independent (input) and dependent (output) variables for gradients.
fvar< T > log_diff_exp(const fvar< T > &x1, const fvar< T > &x2)
fvar< T > expm1(const fvar< T > &x)
vari * vi_
Pointer to the implementation of this variable.
double calculate_chain(double x, double val)