is_cholesky_factor_corr.hpp

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#ifndef STAN_MATH_PRIM_ERR_IS_CHOLESKY_FACTOR_CORR_HPP
#define STAN_MATH_PRIM_ERR_IS_CHOLESKY_FACTOR_CORR_HPP
 
#include <stan/math/prim/fun/Eigen.hpp>
#include <stan/math/prim/meta.hpp>
#include <stan/math/prim/fun/to_ref.hpp>
#include <stan/math/prim/err/is_cholesky_factor.hpp>
#include <stan/math/prim/err/is_unit_vector.hpp>
 
namespace stan {
namespace math {
template <typename EigMat, require_eigen_matrix_dynamic_t<EigMat>* = nullptr>
inline bool is_cholesky_factor_corr(const EigMat& y) {
  const auto& y_ref = to_ref(y);
  if (!is_cholesky_factor(y_ref)) {
    return false;
  }
  for (int i = 0; i < y_ref.rows(); ++i) {
    if (!is_unit_vector(y_ref.row(i))) {
      return false;
    }
  }
  return true;
}
 
}  // namespace math
}  // namespace stan
#endif