All Classes Namespaces Files Functions Variables Typedefs Enumerator Friends Macros
digamma.hpp
Go to the documentation of this file.
#ifndef STAN_MATH_REV_SCAL_FUN_DIGAMMA_HPP
#define STAN_MATH_REV_SCAL_FUN_DIGAMMA_HPP
#include <boost/math/special_functions/zeta.hpp>
#include <stan/math/rev/core.hpp>
#include <stan/math/prim/scal/fun/trigamma.hpp>
#include <stan/math/prim/scal/fun/digamma.hpp>
namespace stan {
namespace math {
namespace {
class digamma_vari : public op_v_vari {
public:
explicit digamma_vari(vari* avi) :
op_v_vari(digamma(avi->val_), avi) {
}
void chain() {
avi_->adj_ += adj_ * trigamma(avi_->val_);
}
};
}
inline var digamma(const stan::math::var& a) {
return var(new digamma_vari(a.vi_));
}
}
}
#endif
stan::math::trigamma
T trigamma(T x)
Definition: trigamma.hpp:50
core.hpp
digamma.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
trigamma.hpp
stan::math::digamma
fvar< T > digamma(const fvar< T > &x)
Definition: digamma.hpp:16

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