math/is__ldlt__factor_8hpp_source.html

#ifndef STAN_MATH_PRIM_ERR_IS_LDLT_FACTOR_HPP

#define STAN_MATH_PRIM_ERR_IS_LDLT_FACTOR_HPP


#include <stan/math/prim/meta.hpp>

#include <stan/math/prim/fun/Eigen.hpp>

#include <stan/math/prim/fun/LDLT_factor.hpp>


namespace stan {

namespace math {


template <typename T>

inline bool is_ldlt_factor(LDLT_factor<T>& A) {

  return A.ldlt().info() == Eigen::Success && A.ldlt().isPositive()

         && (A.ldlt().vectorD().array() > 0).all();

}


}  // namespace math

}  // namespace stan

#endif

Eigen.hpp

stan::math::LDLT_factor
LDLT_factor is a structure that holds a matrix of type T and the LDLT of its values.
Definition LDLT_factor.hpp:21

stan::math::all
constexpr bool all(T x)
Return true if all values in the input are true.
Definition all.hpp:21

stan::math::is_ldlt_factor
bool is_ldlt_factor(LDLT_factor< T > &A)
Return true if the specified LDLT factor is invalid.
Definition is_ldlt_factor.hpp:21

stan
The lgamma implementation in stan-math is based on either the reentrant safe lgamma_r implementation ...
Definition unit_vector_constrain.hpp:15

LDLT_factor.hpp

meta.hpp