log1p_exp.hpp
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#ifndef STAN_MATH_REV_SCAL_FUN_LOG1P_EXP_HPP
#define STAN_MATH_REV_SCAL_FUN_LOG1P_EXP_HPP
#include <stan/math/rev/core.hpp>
#include <stan/math/prim/scal/fun/log1p_exp.hpp>
#include <stan/math/rev/scal/fun/calculate_chain.hpp>
namespace stan {
namespace math {
namespace {
class log1p_exp_v_vari : public op_v_vari {
public:
explicit log1p_exp_v_vari(vari* avi) :
op_v_vari(log1p_exp(avi->val_),
avi) {
}
void chain() {
avi_->adj_ += adj_ * calculate_chain(avi_->val_, val_);
}
};
}
inline var log1p_exp(const var& a) {
return var(new log1p_exp_v_vari(a.vi_));
}
}
}
#endif
core.hpp
stan
Definition: log_sum_exp.hpp:8
stan::math::var
Independent (input) and dependent (output) variables for gradients.
Definition: var.hpp:30
stan::math::var::vi_
vari * vi_
Pointer to the implementation of this variable.
Definition: var.hpp:42
log1p_exp.hpp
calculate_chain.hpp
stan::math::log1p_exp
fvar< T > log1p_exp(const fvar< T > &x)
Definition: log1p_exp.hpp:13
stan::math::calculate_chain
double calculate_chain(double x, double val)
Definition: calculate_chain.hpp:9

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