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log1p.hpp
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#ifndef STAN_MATH_REV_SCAL_FUN_LOG1P_HPP
#define STAN_MATH_REV_SCAL_FUN_LOG1P_HPP
#include <stan/math/rev/core.hpp>
#include <stan/math/prim/scal/fun/constants.hpp>
#include <stan/math/prim/scal/fun/log1p.hpp>
#include <valarray>
namespace stan {
namespace math {
namespace {
class log1p_vari : public op_v_vari {
public:
explicit log1p_vari(vari* avi) :
op_v_vari(stan::math::log1p(avi->val_), avi) {
}
void chain() {
avi_->adj_ += adj_ / (1 + avi_->val_);
}
};
}
inline var log1p(const stan::math::var& a) {
return var(new log1p_vari(a.vi_));
}
}
}
#endif
core.hpp
stan::math::var
Independent (input) and dependent (output) variables for gradients.
Definition: var.hpp:32
stan::math::var::vi_
vari * vi_
Pointer to the implementation of this variable.
Definition: var.hpp:44
constants.hpp
stan::math::log1p
fvar< T > log1p(const fvar< T > &x)
Definition: log1p.hpp:16
log1p.hpp

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