srot()

subroutine srot	(	integer	n,
		real, dimension(*)	sx,
		integer	incx,
		real, dimension(*)	sy,
		integer	incy,
		real	c,
		real	s )

SROT

Purpose:

!>
!>    applies a plane rotation.
!> 

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]	C	!> C is REAL !>
[in]	S	!> S is REAL !>

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Further Details:

!>
!>     jack dongarra, linpack, 3/11/78.
!>     modified 12/3/93, array(1) declarations changed to array(*)
!> 

Definition at line 91 of file srot.f.

*
*  -- Reference BLAS level1 routine --
*  -- Reference BLAS is a software package provided by Univ. of Tennessee,    --
*  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
*
*     .. Scalar Arguments ..
      REAL C,S
      INTEGER INCX,INCY,N
*     ..
*     .. Array Arguments ..
      REAL SX(*),SY(*)
*     ..
*
*  =====================================================================
*
*     .. Local Scalars ..
      REAL STEMP
      INTEGER I,IX,IY
*     ..
      IF (n.LE.0) RETURN
      IF (incx.EQ.1 .AND. incy.EQ.1) THEN
*
*       code for both increments equal to 1
*
         DO i = 1,n
            stemp = c*sx(i) + s*sy(i)
            sy(i) = c*sy(i) - s*sx(i)
            sx(i) = stemp
         END DO
      ELSE
*
*       code for unequal increments or equal increments not equal
*         to 1
*
         ix = 1
         iy = 1
         IF (incx.LT.0) ix = (-n+1)*incx + 1
         IF (incy.LT.0) iy = (-n+1)*incy + 1
         DO i = 1,n
            stemp = c*sx(ix) + s*sy(iy)
            sy(iy) = c*sy(iy) - s*sx(ix)
            sx(ix) = stemp
            ix = ix + incx
            iy = iy + incy
         END DO
      END IF
      RETURN
*
*     End of SROT
*

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