to_vector_array.hpp

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#ifndef STAN_MATH_PRIM_FUN_TO_VECTOR_ARRAY_HPP
#define STAN_MATH_PRIM_FUN_TO_VECTOR_ARRAY_HPP
 
#include <stan/math/prim/meta.hpp>
#include <stan/math/prim/fun/Eigen.hpp>
#include <vector>
 
namespace stan {
namespace math {
 
template <typename EigMat, require_eigen_t<EigMat>* = nullptr>
inline std::vector<Eigen::Matrix<value_type_t<EigMat>, Eigen::Dynamic, 1>>
to_vector_array(const EigMat& matrix) {
  using T = value_type_t<EigMat>;
  std::vector<Eigen::Matrix<T, Eigen::Dynamic, 1>> result;
  result.reserve(matrix.cols());
  for (int j = 0; j < matrix.cols(); ++j) {
    result.push_back(matrix.col(j));
  }
  return result;
}
 
}  // namespace math
}  // namespace stan
#endif