All Classes Namespaces Files Functions Variables Typedefs Enumerator Friends Macros Groups
cbrt.hpp
Go to the documentation of this file.
#ifndef STAN_MATH_REV_SCAL_FUN_CBRT_HPP
#define STAN_MATH_REV_SCAL_FUN_CBRT_HPP
#include <math.h>
#include <stan/math/rev/core.hpp>
#ifdef _MSC_VER
#include <boost/math/special_functions/cbrt.hpp>
using boost::math::cbrt;
#endif
namespace stan {
namespace math {
namespace {
class cbrt_vari : public op_v_vari {
public:
explicit cbrt_vari(vari* avi) :
op_v_vari(::cbrt(avi->val_), avi) {
}
void chain() {
avi_->adj_ += adj_ / (3.0 * val_ * val_);
}
};
}
inline var cbrt(const var& a) {
return var(new cbrt_vari(a.vi_));
}
}
}
#endif
core.hpp
stan::math::cbrt
fvar< T > cbrt(const fvar< T > &x)
Definition: cbrt.hpp:14
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
stan::math::cbrt
var cbrt(const var &a)
Returns the cube root of the specified variable (C99).
Definition: cbrt.hpp:56

[ Stan Home Page ] © 2011–2015, Stan Development Team.