read_corr_matrix.hpp

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#ifndef STAN_MATH_PRIM_FUN_READ_CORR_MATRIX_HPP
#define STAN_MATH_PRIM_FUN_READ_CORR_MATRIX_HPP
 
#include <stan/math/prim/fun/Eigen.hpp>
#include <stan/math/prim/fun/read_corr_L.hpp>
#include <stan/math/prim/fun/multiply_lower_tri_self_transpose.hpp>
 
namespace stan {
namespace math {
 
template <typename T_CPCs, require_eigen_vector_t<T_CPCs>* = nullptr>
Eigen::Matrix<value_type_t<T_CPCs>, Eigen::Dynamic, Eigen::Dynamic>
read_corr_matrix(const T_CPCs& CPCs, size_t K) {
  if (K == 0) {
    return {};
  }
 
  return multiply_lower_tri_self_transpose(read_corr_L(CPCs, K));
}
 
template <typename T_CPCs, typename Lp,
          require_eigen_vector_t<T_CPCs>* = nullptr,
          require_convertible_t<value_type_t<T_CPCs>, Lp>* = nullptr>
Eigen::Matrix<value_type_t<T_CPCs>, Eigen::Dynamic, Eigen::Dynamic>
read_corr_matrix(const T_CPCs& CPCs, size_t K, Lp& log_prob) {
  if (K == 0) {
    return {};
  }
 
  return multiply_lower_tri_self_transpose(read_corr_L(CPCs, K, log_prob));
}
 
}  // namespace math
}  // namespace stan
 
#endif