subtract.hpp

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#ifndef STAN_MATH_PRIM_FUN_SUBTRACT_HPP
#define STAN_MATH_PRIM_FUN_SUBTRACT_HPP
 
#include <stan/math/prim/meta.hpp>
#include <stan/math/prim/err.hpp>
#include <stan/math/prim/fun/Eigen.hpp>
 
namespace stan {
namespace math {
 
template <typename ScalarA, typename ScalarB,
          require_all_stan_scalar_t<ScalarA, ScalarB>* = nullptr,
          require_all_not_var_t<ScalarA, ScalarB>* = nullptr>
inline return_type_t<ScalarA, ScalarB> subtract(const ScalarA& a,
                                                const ScalarB& b) {
  return a - b;
}
 
template <typename Mat1, typename Mat2,
          require_all_eigen_t<Mat1, Mat2>* = nullptr,
          require_all_not_st_var<Mat1, Mat2>* = nullptr>
inline auto subtract(const Mat1& m1, const Mat2& m2) {
  check_matching_dims("subtract", "m1", m1, "m2", m2);
  return m1 - m2;
}
 
template <typename Scal, typename Mat, require_stan_scalar_t<Scal>* = nullptr,
          require_eigen_t<Mat>* = nullptr,
          require_all_not_st_var<Mat, Scal>* = nullptr>
inline auto subtract(const Scal c, const Mat& m) {
  return (c - m.array()).matrix();
}
 
template <typename Mat, typename Scal, require_eigen_t<Mat>* = nullptr,
          require_stan_scalar_t<Scal>* = nullptr,
          require_all_not_st_var<Scal, Mat>* = nullptr>
inline auto subtract(const Mat& m, const Scal c) {
  return (m.array() - c).matrix();
}
 
}  // namespace math
}  // namespace stan
 
#endif