determinant.hpp

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#ifndef STAN_MATH_FWD_FUN_DETERMINANT_HPP
#define STAN_MATH_FWD_FUN_DETERMINANT_HPP
 
#include <stan/math/prim/meta.hpp>
#include <stan/math/prim/err.hpp>
#include <stan/math/prim/fun/Eigen.hpp>
#include <stan/math/prim/fun/to_ref.hpp>
#include <stan/math/fwd/core.hpp>
 
namespace stan {
namespace math {
 
template <typename EigMat, require_eigen_vt<is_fvar, EigMat>* = nullptr>
inline value_type_t<EigMat> determinant(const EigMat& m) {
  check_square("determinant", "m", m);
  const auto& m_ref = to_ref(m);
 
  const typename value_type_t<EigMat>::Scalar vals = m_ref.val().determinant();
  return {vals, vals * (m_ref.val().inverse() * m_ref.d()).trace()};
}
 
}  // namespace math
}  // namespace stan
#endif