--- rpl/lapack/blas/drotm.f 2011/07/22 07:38:01 1.8 +++ rpl/lapack/blas/drotm.f 2011/11/21 20:37:07 1.9 @@ -1,54 +1,114 @@ - SUBROUTINE DROTM(N,DX,INCX,DY,INCY,DPARAM) -* .. Scalar Arguments .. - INTEGER INCX,INCY,N -* .. -* .. Array Arguments .. - DOUBLE PRECISION DPARAM(5),DX(*),DY(*) -* .. -* -* Purpose -* ======= -* -* APPLY THE MODIFIED GIVENS TRANSFORMATION, H, TO THE 2 BY N MATRIX -* -* (DX**T) , WHERE **T INDICATES TRANSPOSE. THE ELEMENTS OF DX ARE IN -* (DY**T) +*> \brief \b DROTM * -* DX(LX+I*INCX), I = 0 TO N-1, WHERE LX = 1 IF INCX .GE. 0, ELSE -* LX = (-INCX)*N, AND SIMILARLY FOR SY USING LY AND INCY. -* WITH DPARAM(1)=DFLAG, H HAS ONE OF THE FOLLOWING FORMS.. +* =========== DOCUMENTATION =========== * -* DFLAG=-1.D0 DFLAG=0.D0 DFLAG=1.D0 DFLAG=-2.D0 +* Online html documentation available at +* http://www.netlib.org/lapack/explore-html/ * -* (DH11 DH12) (1.D0 DH12) (DH11 1.D0) (1.D0 0.D0) -* H=( ) ( ) ( ) ( ) -* (DH21 DH22), (DH21 1.D0), (-1.D0 DH22), (0.D0 1.D0). -* SEE DROTMG FOR A DESCRIPTION OF DATA STORAGE IN DPARAM. +* Definition: +* =========== +* +* SUBROUTINE DROTM(N,DX,INCX,DY,INCY,DPARAM) +* +* .. Scalar Arguments .. +* INTEGER INCX,INCY,N +* .. +* .. Array Arguments .. +* DOUBLE PRECISION DPARAM(5),DX(*),DY(*) +* .. +* +* +*> \par Purpose: +* ============= +*> +*> \verbatim +*> +*> APPLY THE MODIFIED GIVENS TRANSFORMATION, H, TO THE 2 BY N MATRIX +*> +*> (DX**T) , WHERE **T INDICATES TRANSPOSE. THE ELEMENTS OF DX ARE IN +*> (DY**T) +*> +*> DX(LX+I*INCX), I = 0 TO N-1, WHERE LX = 1 IF INCX .GE. 0, ELSE +*> LX = (-INCX)*N, AND SIMILARLY FOR SY USING LY AND INCY. +*> WITH DPARAM(1)=DFLAG, H HAS ONE OF THE FOLLOWING FORMS.. +*> +*> DFLAG=-1.D0 DFLAG=0.D0 DFLAG=1.D0 DFLAG=-2.D0 +*> +*> (DH11 DH12) (1.D0 DH12) (DH11 1.D0) (1.D0 0.D0) +*> H=( ) ( ) ( ) ( ) +*> (DH21 DH22), (DH21 1.D0), (-1.D0 DH22), (0.D0 1.D0). +*> SEE DROTMG FOR A DESCRIPTION OF DATA STORAGE IN DPARAM. +*> \endverbatim +* +* Arguments: +* ========== +* +*> \param[in] N +*> \verbatim +*> N is INTEGER +*> number of elements in input vector(s) +*> \endverbatim +*> +*> \param[in,out] DX +*> \verbatim +*> DX is DOUBLE PRECISION array, dimension N +*> double precision vector with N elements +*> \endverbatim +*> +*> \param[in] INCX +*> \verbatim +*> INCX is INTEGER +*> storage spacing between elements of DX +*> \endverbatim +*> +*> \param[in,out] DY +*> \verbatim +*> DY is DOUBLE PRECISION array, dimension N +*> double precision vector with N elements +*> \endverbatim +*> +*> \param[in] INCY +*> \verbatim +*> INCY is INTEGER +*> storage spacing between elements of DY +*> \endverbatim +*> +*> \param[in,out] DPARAM +*> \verbatim +*> DPARAM is DOUBLE PRECISION array, dimension 5 +*> DPARAM(1)=DFLAG +*> DPARAM(2)=DH11 +*> DPARAM(3)=DH21 +*> DPARAM(4)=DH12 +*> DPARAM(5)=DH22 +*> \endverbatim +* +* Authors: +* ======== +* +*> \author Univ. of Tennessee +*> \author Univ. of California Berkeley +*> \author Univ. of Colorado Denver +*> \author NAG Ltd. * -* Arguments -* ========= +*> \date November 2011 * -* N (input) INTEGER -* number of elements in input vector(s) +*> \ingroup double_blas_level1 * -* DX (input/output) DOUBLE PRECISION array, dimension N -* double precision vector with N elements -* -* INCX (input) INTEGER -* storage spacing between elements of DX -* -* DY (input/output) DOUBLE PRECISION array, dimension N -* double precision vector with N elements +* ===================================================================== + SUBROUTINE DROTM(N,DX,INCX,DY,INCY,DPARAM) * -* INCY (input) INTEGER -* storage spacing between elements of DY +* -- Reference BLAS level1 routine (version 3.4.0) -- +* -- Reference BLAS is a software package provided by Univ. of Tennessee, -- +* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..-- +* November 2011 * -* DPARAM (input/output) DOUBLE PRECISION array, dimension 5 -* DPARAM(1)=DFLAG -* DPARAM(2)=DH11 -* DPARAM(3)=DH21 -* DPARAM(4)=DH12 -* DPARAM(5)=DH22 +* .. Scalar Arguments .. + INTEGER INCX,INCY,N +* .. +* .. Array Arguments .. + DOUBLE PRECISION DPARAM(5),DX(*),DY(*) +* .. * * ===================================================================== *