qrd -- QR factorization.
   -1: by    row, storage=qrd_nosaveq
   -2: by    row, storage=qrd_saveq1
   -3: by    row, storage=qrd_saveq

  -11: by column, storage=qrd_nosaveq
  -12: by column, storage=qrd_saveq1
  -13: by column, storage=qrd_saveq