srotm()

subroutine srotm	(	integer	n,
		real, dimension(*)	sx,
		integer	incx,
		real, dimension(*)	sy,
		integer	incy,
		real, dimension(5)	sparam )

SROTM

Purpose:

!>
!>    APPLY THE MODIFIED GIVENS TRANSFORMATION, H, TO THE 2 BY N MATRIX
!>
!>    (SX**T) , WHERE **T INDICATES TRANSPOSE. THE ELEMENTS OF SX ARE IN
!>    (SX**T)
!>
!>    SX(LX+I*INCX), I = 0 TO N-1, WHERE LX = 1 IF INCX .GE. 0, ELSE
!>    LX = (-INCX)*N, AND SIMILARLY FOR SY USING USING LY AND INCY.
!>    WITH SPARAM(1)=SFLAG, H HAS ONE OF THE FOLLOWING FORMS..
!>
!>    SFLAG=-1.E0     SFLAG=0.E0        SFLAG=1.E0     SFLAG=-2.E0
!>
!>      (SH11  SH12)    (1.E0  SH12)    (SH11  1.E0)    (1.E0  0.E0)
!>    H=(          )    (          )    (          )    (          )
!>      (SH21  SH22),   (SH21  1.E0),   (-1.E0 SH22),   (0.E0  1.E0).
!>    SEE  SROTMG FOR A DESCRIPTION OF DATA STORAGE IN SPARAM.
!>
!> 

Parameters

[in]	N	!> N is INTEGER !> number of elements in input vector(s) !>
[in,out]	SX	!> SX is REAL array, dimension ( 1 + ( N - 1 )*abs( INCX ) ) !>
[in]	INCX	!> INCX is INTEGER !> storage spacing between elements of SX !>
[in,out]	SY	!> SY is REAL array, dimension ( 1 + ( N - 1 )*abs( INCY ) ) !>
[in]	INCY	!> INCY is INTEGER !> storage spacing between elements of SY !>
[in]	SPARAM	!> SPARAM is REAL array, dimension (5) !> SPARAM(1)=SFLAG !> SPARAM(2)=SH11 !> SPARAM(3)=SH21 !> SPARAM(4)=SH12 !> SPARAM(5)=SH22 !>

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.