drotm()

subroutine drotm	(	integer	n,
		double precision, dimension(*)	dx,
		integer	incx,
		double precision, dimension(*)	dy,
		integer	incy,
		double precision, dimension(5)	dparam )

DROTM

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)
!>
!>    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.
!> 

Parameters

[in]	N	!> N is INTEGER !> number of elements in input vector(s) !>
[in,out]	DX	!> DX is DOUBLE PRECISION array, dimension ( 1 + ( N - 1 )*abs( INCX ) ) !>
[in]	INCX	!> INCX is INTEGER !> storage spacing between elements of DX !>
[in,out]	DY	!> DY is DOUBLE PRECISION array, dimension ( 1 + ( N - 1 )*abs( INCY ) ) !>
[in]	INCY	!> INCY is INTEGER !> storage spacing between elements of DY !>
[in]	DPARAM	!> DPARAM is DOUBLE PRECISION array, dimension (5) !> DPARAM(1)=DFLAG !> DPARAM(2)=DH11 !> DPARAM(3)=DH21 !> DPARAM(4)=DH12 !> DPARAM(5)=DH22 !>

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.