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log2.hpp
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#ifndef STAN_MATH_REV_SCAL_FUN_LOG2_HPP
#define STAN_MATH_REV_SCAL_FUN_LOG2_HPP
#include <stan/math/rev/core.hpp>
#include <stan/math/prim/scal/fun/log2.hpp>
#include <stan/math/prim/scal/fun/constants.hpp>
namespace stan {
namespace math {
namespace {
class log2_vari : public op_v_vari {
public:
explicit log2_vari(vari* avi) :
op_v_vari(stan::math::log2(avi->val_), avi) {
}
void chain() {
avi_->adj_ += adj_ / (stan::math::LOG_2 * avi_->val_);
}
};
}
inline var log2(const stan::math::var& a) {
return var(new log2_vari(a.vi_));
}
}
}
#endif
stan::math::LOG_2
const double LOG_2
The natural logarithm of 2, .
Definition: constants.hpp:33
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
log2.hpp
stan::math::log2
fvar< T > log2(const fvar< T > &x)
Definition: log2.hpp:17

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