Input to ORDEIG must not contain NaN or Inf. Input must be 2-D. Input must be square. Input must be full. For ORDEIG(A), A must be upper triangular when it is complex. For ORDEIG(A), A must be block upper triangular with 1-by-1 and 2-by-2 blocks on its diagonal when A is real. Inputs must be single or double. Inputs must be 2-D. Inputs must be square. Inputs must be the same size. Inputs must be full. For ORDEIG(A,B), A and B must be upper triangular when A or B is complex. For ORDEIG(A,B) when A and B are real, A must be block upper triangular with 1-by-1 and 2-by-2 blocks on its diagonal. In addition, B must be upper triangular.