mdivide_left_tri_low.hpp

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#ifndef STAN_MATH_PRIM_FUN_MDIVIDE_LEFT_TRI_LOW_HPP
#define STAN_MATH_PRIM_FUN_MDIVIDE_LEFT_TRI_LOW_HPP
 
#include <stan/math/prim/err.hpp>
#include <stan/math/prim/fun/Eigen.hpp>
#include <stan/math/prim/fun/mdivide_left_tri.hpp>
 
namespace stan {
namespace math {
 
template <typename T1, typename T2, require_all_eigen_t<T1, T2>* = nullptr,
          require_all_not_eigen_vt<is_fvar, T1, T2>* = nullptr>
inline Eigen::Matrix<return_type_t<T1, T2>, std::decay_t<T1>::RowsAtCompileTime,
                     std::decay_t<T2>::ColsAtCompileTime>
mdivide_left_tri_low(T1&& A, T2&& b) {
  check_square("mdivide_left_tri_low", "A", A);
  check_multiplicable("mdivide_left_tri_low", "A", A, "b", b);
  if (A.rows() == 0) {
    return {0, b.cols()};
  }
 
  return mdivide_left_tri<Eigen::Lower>(std::forward<T1>(A),
                                        std::forward<T2>(b));
}
 
template <typename T, require_eigen_t<T>* = nullptr,
          require_not_eigen_vt<is_fvar, T>* = nullptr>
inline plain_type_t<T> mdivide_left_tri_low(const T& A) {
  check_square("mdivide_left_tri_low", "A", A);
  if (A.rows() == 0) {
    return {};
  }
 
  return mdivide_left_tri<Eigen::Lower>(A);
}
 
}  // namespace math
}  // namespace stan
 
#endif