rpl/lapack/blas/zdscal.f - diff

Return to zdscal.f CVS log

Up to [local] / rpl / lapack / blas

Diff for /rpl/lapack/blas/zdscal.f between versions 1.5 and 1.16

-version 1.5, 2010/08/13 21:03:41
+version 1.16, 2023/08/07 08:38:44
  Line 1
+ *> \brief \b ZDSCAL
+ *
+ *  =========== DOCUMENTATION ===========
+ *
+ * Online html documentation available at
+ *            http://www.netlib.org/lapack/explore-html/
+ *
+ *  Definition:
+ *  ===========
+ *
+ *       SUBROUTINE ZDSCAL(N,DA,ZX,INCX)
+ *
+ *       .. Scalar Arguments ..
+ *       DOUBLE PRECISION DA
+ *       INTEGER INCX,N
+ *       ..
+ *       .. Array Arguments ..
+ *       COMPLEX*16 ZX(*)
+ *       ..
+ *
+ *
+ *> \par Purpose:
+ *  =============
+ *>
+ *> \verbatim
+ *>
+ *>    ZDSCAL scales a vector by a constant.
+ *> \endverbatim
+ *
+ *  Arguments:
+ *  ==========
+ *
+ *> \param[in] N
+ *> \verbatim
+ *>          N is INTEGER
+ *>         number of elements in input vector(s)
+ *> \endverbatim
+ *>
+ *> \param[in] DA
+ *> \verbatim
+ *>          DA is DOUBLE PRECISION
+ *>           On entry, DA specifies the scalar alpha.
+ *> \endverbatim
+ *>
+ *> \param[in,out] ZX
+ *> \verbatim
+ *>          ZX is COMPLEX*16 array, dimension ( 1 + ( N - 1 )*abs( INCX ) )
+ *> \endverbatim
+ *>
+ *> \param[in] INCX
+ *> \verbatim
+ *>          INCX is INTEGER
+ *>         storage spacing between elements of ZX
+ *> \endverbatim
+ *
+ *  Authors:
+ *  ========
+ *
+ *> \author Univ. of Tennessee
+ *> \author Univ. of California Berkeley
+ *> \author Univ. of Colorado Denver
+ *> \author NAG Ltd.
+ *
+ *> \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 ZDSCAL(N,DA,ZX,INCX)
+ *
+ *  -- 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 ..
        DOUBLE PRECISION DA
        INTEGER INCX,N
  *     ..
  *     .. Array Arguments ..
-       DOUBLE COMPLEX ZX(*)
+       COMPLEX*16 ZX(*)
  *     ..
  *
- *  Purpose
- *  =======
- *
- *     ZDSCAL scales a vector by a constant.
- *
- *  Further Details
- *  ===============
- *
- *     jack dongarra, 3/11/78.
- *     modified 3/93 to return if incx .le. 0.
- *     modified 12/3/93, array(1) declarations changed to array(*)
- *
  *  =====================================================================
  *
  *     .. Local Scalars ..
-       INTEGER I,IX
+       INTEGER I,NINCX
+ *     .. Parameters ..
+       DOUBLE PRECISION ONE
+       PARAMETER (ONE=1.0D+0)
  *     ..
  *     .. Intrinsic Functions ..
-       INTRINSIC DCMPLX
+       INTRINSIC DBLE, DCMPLX, DIMAG
  *     ..
-       IF (N.LE.0 .OR. INCX.LE.0) RETURN
+       IF (N.LE.0 .OR. INCX.LE.0 .OR. DA.EQ.ONE) RETURN
-       IF (INCX.EQ.1) GO TO 20
+       IF (INCX.EQ.1) THEN
+ *
+ *        code for increment equal to 1
+ *
+          DO I = 1,N
+             ZX(I) = DCMPLX(DA*DBLE(ZX(I)),DA*DIMAG(ZX(I)))
+          END DO
+       ELSE
  *
  *        code for increment not equal to 1
  *
-       IX = 1
+          NINCX = N*INCX
-       DO 10 I = 1,N
+          DO I = 1,NINCX,INCX
-           ZX(IX) = DCMPLX(DA,0.0d0)*ZX(IX)
+             ZX(I) = DCMPLX(DA*DBLE(ZX(I)),DA*DIMAG(ZX(I)))
-           IX = IX + INCX
+          END DO
-CONTINUE
+       END IF
        RETURN
  *
- *        code for increment equal to 1
+ *     End of ZDSCAL
  *
-DO 30 I = 1,N
-           ZX(I) = DCMPLX(DA,0.0d0)*ZX(I)
-CONTINUE
-       RETURN
        END

CVSweb interface <joel.bertrand@systella.fr>

Removed from v.1.5
changed lines
	Added in v.1.16