col.hpp

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#ifndef STAN_MATH_PRIM_FUN_COL_HPP
#define STAN_MATH_PRIM_FUN_COL_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 T, require_matrix_t<T>* = nullptr>
inline auto col(T&& m, size_t j) {
  check_column_index("col", "j", m, j);
  return make_holder([j](auto&& m_) { return m_.col(j - 1); },
                     std::forward<T>(m));
}
 
}  // namespace math
}  // namespace stan
 
#endif