math/prim_2fun_2log__determinant__ldlt_8hpp_source.html

#ifndef STAN_MATH_PRIM_FUN_LOG_DETERMINANT_LDLT_HPP

#define STAN_MATH_PRIM_FUN_LOG_DETERMINANT_LDLT_HPP


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


namespace stan {

namespace math {


template <typename T, require_not_rev_matrix_t<T>* = nullptr>

inline value_type_t<T> log_determinant_ldlt(LDLT_factor<T>& A) {

  if (A.matrix().size() == 0) {

    return 0;

  }


  return sum(log(A.ldlt().vectorD().array()));

}


}  // namespace math

}  // namespace stan


#endif

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::value_type_t
typename value_type< T >::type value_type_t
Helper function for accessing underlying type.
Definition value_type.hpp:35

stan::math::log_determinant_ldlt
value_type_t< T > log_determinant_ldlt(LDLT_factor< T > &A)
Returns log(abs(det(A))) given a LDLT_factor of A.
Definition log_determinant_ldlt.hpp:17

stan::math::log
fvar< T > log(const fvar< T > &x)
Definition log.hpp:18

stan::math::sum
auto sum(const std::vector< T > &m)
Return the sum of the entries of the specified standard vector.
Definition sum.hpp:23

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