1 #ifndef STAN_MATH_REV_SCAL_FUN_LOG_HPP
2 #define STAN_MATH_REV_SCAL_FUN_LOG_HPP
11 class log_vari :
public op_v_vari {
13 explicit log_vari(vari* avi) :
14 op_v_vari(
std::
log(avi->val_), avi) {
17 avi_->adj_ += adj_ / avi_->val_;
51 return var(
new log_vari(a.
vi_));
fvar< T > log(const fvar< T > &x)
Independent (input) and dependent (output) variables for gradients.
vari * vi_
Pointer to the implementation of this variable.