*> \brief \b DSCAL
*
*  =========== DOCUMENTATION ===========
*
* Online html documentation available at 
*            http://www.netlib.org/lapack/explore-html/ 
*
*  Definition:
*  ===========
*
*       SUBROUTINE DSCAL(N,DA,DX,INCX)
* 
*       .. Scalar Arguments ..
*       DOUBLE PRECISION DA
*       INTEGER INCX,N
*       ..
*       .. Array Arguments ..
*       DOUBLE PRECISION DX(*)
*       ..
*  
*
*> \par Purpose:
*  =============
*>
*> \verbatim
*>
*>    DSCAL scales a vector by a constant.
*>    uses unrolled loops for increment equal to one.
*> \endverbatim
*
*  Authors:
*  ========
*
*> \author Univ. of Tennessee 
*> \author Univ. of California Berkeley 
*> \author Univ. of Colorado Denver 
*> \author NAG Ltd. 
*
*> \date November 2011
*
*> \ingroup double_blas_level1
*
*> \par Further Details:
*  =====================
*>
*> \verbatim
*>
*>     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(*)
*> \endverbatim
*>
*  =====================================================================
      SUBROUTINE GAL_DSCAL(N,DA,DX,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 ..
      DOUBLE PRECISION DA
      INTEGER INCX,N
*     ..
*     .. Array Arguments ..
      DOUBLE PRECISION DX(*)
*     ..
*
*  =====================================================================
*
*     .. Local Scalars ..
      INTEGER I,M,MP1,NINCX
*     ..
*     .. Intrinsic Functions ..
      INTRINSIC MOD
*     ..
      IF(N.LE.0.OR.INCX.LE.0)RETURN
      IF(INCX.EQ.1)THEN
*
*        code for increment equal to 1
*
*
*        clean-up loop
*
      M=MOD(N,5)
      IF(M.NE.0)THEN
      DO I=1,M
      DX(I)=DA*DX(I)
      END DO 
      IF(N.LT.5)RETURN
      END IF
      MP1=M+1
      DO I=MP1,N,5
      DX(I)=DA*DX(I)
      DX(I+1)=DA*DX(I+1)
      DX(I+2)=DA*DX(I+2)
      DX(I+3)=DA*DX(I+3)
      DX(I+4)=DA*DX(I+4)
      END DO 
      ELSE 
*
*        code for increment not equal to 1
*
      NINCX=N*INCX
      DO I=1,NINCX,INCX
      DX(I)=DA*DX(I)
      END DO 
      END IF
      RETURN
      END 
