The Computation of Elementary Unitary MatricesR

  title={The Computation of Elementary Unitary MatricesR},
  author={Richard B. Lehoucq},
The construction of elementary unitary matrices that transform a complex vector to a real multiple of e 1 , the rst column of the identity matrix, are studied. We survey the two well known forms and present what appears to be relatively unknown third form implemented by LAPACK subroutine CLARFG.