zscal.f

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*> \brief \b ZSCAL
*
*  =========== DOCUMENTATION ===========
*
* Online html documentation available at 
*            http://www.netlib.org/lapack/explore-html/ 
*
*  Definition:
*  ===========
*
*       SUBROUTINE ZSCAL(N,ZA,ZX,INCX)
* 
*       .. Scalar Arguments ..
*       COMPLEX*16 ZA
*       INTEGER INCX,N
*       ..
*       .. Array Arguments ..
*       COMPLEX*16 ZX(*)
*       ..
*  
*
*> \par Purpose:
*  =============
*>
*> \verbatim
*>
*>    ZSCAL scales a vector by a constant.
*> \endverbatim
*
*  Authors:
*  ========
*
*> \author Univ. of Tennessee 
*> \author Univ. of California Berkeley 
*> \author Univ. of Colorado Denver 
*> \author NAG Ltd. 
*
*> \date November 2011
*
*> \ingroup complex16_blas_level1
*
*> \par Further Details:
*  =====================
*>
*> \verbatim
*>
*>     jack dongarra, 3/11/78.
*>     modified 3/93 to return if incx .le. 0.
*>     modified 12/3/93, array(1) declarations changed to array(*)
*> \endverbatim
*>
*  =====================================================================
      SUBROUTINE zscal(N,ZA,ZX,INCX)
*
*  -- 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
*
*     .. Scalar Arguments ..
      COMPLEX*16 ZA
      INTEGER INCX,N
*     ..
*     .. Array Arguments ..
      COMPLEX*16 ZX(*)
*     ..
*
*  =====================================================================
*
*     .. Local Scalars ..
      INTEGER I,NINCX
*     ..
      IF (n.LE.0 .OR. incx.LE.0) RETURN
      IF (incx.EQ.1) THEN
*
*        code for increment equal to 1
*
         DO i = 1,n
            zx(i) = za*zx(i)
         END DO
      ELSE
*
*        code for increment not equal to 1
*
         nincx = n*incx
         DO i = 1,nincx,incx
            zx(i) = za*zx(i)
         END DO
      END IF
      RETURN
      END