csscal()

subroutine csscal	(	integer	n,
		real	sa,
		complex, dimension(*)	cx,
		integer	incx
	)

CSSCAL

Purpose:

    CSSCAL scales a complex vector by a real constant.

Parameters

[in]	N	N is INTEGER number of elements in input vector(s)
[in]	SA	SA is REAL On entry, SA specifies the scalar alpha.
[in,out]	CX	CX is COMPLEX array, dimension ( 1 + ( N - 1 )*abs( INCX ) )
[in]	INCX	INCX is INTEGER storage spacing between elements of CX

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Further Details:

     jack dongarra, linpack, 3/11/78.
     modified 3/93 to return if incx .le. 0.
     modified 12/3/93, array(1) declarations changed to array(*)

Definition at line 77 of file csscal.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 SA
      INTEGER INCX,N
*     ..
*     .. Array Arguments ..
      COMPLEX CX(*)
*     ..
*
*  =====================================================================
*
*     .. Local Scalars ..
      INTEGER I,NINCX
*     ..
*     .. Parameters ..
      REAL ONE
      parameter(one=1.0e+0)
*     ..
*     .. Intrinsic Functions ..
      INTRINSIC aimag,cmplx,real
*     ..
      IF (n.LE.0 .OR. incx.LE.0 .OR. sa.EQ.one) RETURN
      IF (incx.EQ.1) THEN
*
*        code for increment equal to 1
*
         DO i = 1,n
            cx(i) = cmplx(sa*real(cx(i)),sa*aimag(cx(i)))
         END DO
      ELSE
*
*        code for increment not equal to 1
*
         nincx = n*incx
         DO i = 1,nincx,incx
            cx(i) = cmplx(sa*real(cx(i)),sa*aimag(cx(i)))
         END DO
      END IF
      RETURN
*
*     End of CSSCAL
*