identity_matrix.hpp

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#ifndef STAN_MATH_PRIM_FUN_IDENTITY_MATRIX_HPP
#define STAN_MATH_PRIM_FUN_IDENTITY_MATRIX_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 = Eigen::MatrixXd, require_eigen_t<T>* = nullptr>
inline auto identity_matrix(int K) {
  check_nonnegative("identity_matrix", "size", K);
  return T::Identity(K, K);
}
 
}  // namespace math
}  // namespace stan
 
#endif