clarfg.f

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*> \brief \b CLARFG generates an elementary reflector (Householder matrix).
*
*  =========== DOCUMENTATION ===========
*
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*            http://www.netlib.org/lapack/explore-html/ 
*
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*
*  Definition:
*  ===========
*
*       SUBROUTINE CLARFG( N, ALPHA, X, INCX, TAU )
* 
*       .. Scalar Arguments ..
*       INTEGER            INCX, N
*       COMPLEX            ALPHA, TAU
*       ..
*       .. Array Arguments ..
*       COMPLEX            X( * )
*       ..
*  
*
*> \par Purpose:
*  =============
*>
*> \verbatim
*>
*> CLARFG generates a complex elementary reflector H of order n, such
*> that
*>
*>       H**H * ( alpha ) = ( beta ),   H**H * H = I.
*>              (   x   )   (   0  )
*>
*> where alpha and beta are scalars, with beta real, and x is an
*> (n-1)-element complex vector. H is represented in the form
*>
*>       H = I - tau * ( 1 ) * ( 1 v**H ) ,
*>                     ( v )
*>
*> where tau is a complex scalar and v is a complex (n-1)-element
*> vector. Note that H is not hermitian.
*>
*> If the elements of x are all zero and alpha is real, then tau = 0
*> and H is taken to be the unit matrix.
*>
*> Otherwise  1 <= real(tau) <= 2  and  abs(tau-1) <= 1 .
*> \endverbatim
*
*  Arguments:
*  ==========
*
*> \param[in] N
*> \verbatim
*>          N is INTEGER
*>          The order of the elementary reflector.
*> \endverbatim
*>
*> \param[in,out] ALPHA
*> \verbatim
*>          ALPHA is COMPLEX
*>          On entry, the value alpha.
*>          On exit, it is overwritten with the value beta.
*> \endverbatim
*>
*> \param[in,out] X
*> \verbatim
*>          X is COMPLEX array, dimension
*>                         (1+(N-2)*abs(INCX))
*>          On entry, the vector x.
*>          On exit, it is overwritten with the vector v.
*> \endverbatim
*>
*> \param[in] INCX
*> \verbatim
*>          INCX is INTEGER
*>          The increment between elements of X. INCX > 0.
*> \endverbatim
*>
*> \param[out] TAU
*> \verbatim
*>          TAU is COMPLEX
*>          The value tau.
*> \endverbatim
*
*  Authors:
*  ========
*
*> \author Univ. of Tennessee 
*> \author Univ. of California Berkeley 
*> \author Univ. of Colorado Denver 
*> \author NAG Ltd. 
*
*> \date September 2012
*
*> \ingroup complexOTHERauxiliary
*
*  =====================================================================
      SUBROUTINE clarfg( N, ALPHA, X, INCX, TAU )
*
*  -- LAPACK auxiliary routine (version 3.4.2) --
*  -- LAPACK is a software package provided by Univ. of Tennessee,    --
*  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
*     September 2012
*
*     .. Scalar Arguments ..
      INTEGER            incx, n
      COMPLEX            alpha, tau
*     ..
*     .. Array Arguments ..
      COMPLEX            x( * )
*     ..
*
*  =====================================================================
*
*     .. Parameters ..
      REAL               one, zero
      parameter( one = 1.0e+0, zero = 0.0e+0 )
*     ..
*     .. Local Scalars ..
      INTEGER            j, knt
      REAL               alphi, alphr, beta, rsafmn, safmin, xnorm
*     ..
*     .. External Functions ..
      REAL               scnrm2, slamch, slapy3
      COMPLEX            cladiv
      EXTERNAL           scnrm2, slamch, slapy3, cladiv
*     ..
*     .. Intrinsic Functions ..
      INTRINSIC          abs, aimag, cmplx, REAL, sign
*     ..
*     .. External Subroutines ..
      EXTERNAL           cscal, csscal
*     ..
*     .. Executable Statements ..
*
      IF( n.LE.0 ) THEN
         tau = zero
         return
      END IF
*
      xnorm = scnrm2( n-1, x, incx )
      alphr = REAL( alpha )
      alphi = aimag( alpha )
*
      IF( xnorm.EQ.zero .AND. alphi.EQ.zero ) THEN
*
*        H  =  I
*
         tau = zero
      ELSE
*
*        general case
*
         beta = -sign( slapy3( alphr, alphi, xnorm ), alphr )
         safmin = slamch( 'S' ) / slamch( 'E' )
         rsafmn = one / safmin
*
         knt = 0
         IF( abs( beta ).LT.safmin ) THEN
*
*           XNORM, BETA may be inaccurate; scale X and recompute them
*
   10       continue
            knt = knt + 1
            CALL csscal( n-1, rsafmn, x, incx )
            beta = beta*rsafmn
            alphi = alphi*rsafmn
            alphr = alphr*rsafmn
            IF( abs( beta ).LT.safmin )
     $         go to 10
*
*           New BETA is at most 1, at least SAFMIN
*
            xnorm = scnrm2( n-1, x, incx )
            alpha = cmplx( alphr, alphi )
            beta = -sign( slapy3( alphr, alphi, xnorm ), alphr )
         END IF
         tau = cmplx( ( beta-alphr ) / beta, -alphi / beta )
         alpha = cladiv( cmplx( one ), alpha-beta )
         CALL cscal( n-1, alpha, x, incx )
*
*        If ALPHA is subnormal, it may lose relative accuracy
*
         DO 20 j = 1, knt
            beta = beta*safmin
 20      continue
         alpha = beta
      END IF
*
      return
*
*     End of CLARFG
*
      END