rpl/lapack/blas/dzasum.f - diff

Return to dzasum.f CVS log

Up to [local] / rpl / lapack / blas

Diff for /rpl/lapack/blas/dzasum.f between versions 1.3 and 1.17

-version 1.3, 2010/08/06 15:32:20
+version 1.17, 2023/08/07 08:38:44
  Line 1
+ *> \brief \b DZASUM
+ *
+ *  =========== DOCUMENTATION ===========
+ *
+ * Online html documentation available at
+ *            http://www.netlib.org/lapack/explore-html/
+ *
+ *  Definition:
+ *  ===========
+ *
+ *       DOUBLE PRECISION FUNCTION DZASUM(N,ZX,INCX)
+ *
+ *       .. Scalar Arguments ..
+ *       INTEGER INCX,N
+ *       ..
+ *       .. Array Arguments ..
+ *       COMPLEX*16 ZX(*)
+ *       ..
+ *
+ *
+ *> \par Purpose:
+ *  =============
+ *>
+ *> \verbatim
+ *>
+ *>    DZASUM takes the sum of the (|Re(.)| + |Im(.)|)'s of a complex vector and
+ *>    returns a double precision result.
+ *> \endverbatim
+ *
+ *  Arguments:
+ *  ==========
+ *
+ *> \param[in] N
+ *> \verbatim
+ *>          N is INTEGER
+ *>         number of elements in input vector(s)
+ *> \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 double_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
+ *>
+ *  =====================================================================
        DOUBLE PRECISION FUNCTION DZASUM(N,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 ..
        INTEGER INCX,N
  *     ..
  *     .. Array Arguments ..
-       DOUBLE COMPLEX ZX(*)
+       COMPLEX*16 ZX(*)
  *     ..
  *
- *  Purpose
- *  =======
- *
- *     DZASUM takes the sum of the absolute values.
- *
- *  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 ..
        DOUBLE PRECISION STEMP
-       INTEGER I,IX
+       INTEGER I,NINCX
  *     ..
  *     .. External Functions ..
        DOUBLE PRECISION DCABS1
- Line 31
+ Line 94
        DZASUM = 0.0d0
        STEMP = 0.0d0
        IF (N.LE.0 .OR. INCX.LE.0) RETURN
-       IF (INCX.EQ.1) GO TO 20
+       IF (INCX.EQ.1) THEN
+ *
+ *        code for increment equal to 1
+ *
+          DO I = 1,N
+             STEMP = STEMP + DCABS1(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
-           STEMP = STEMP + DCABS1(ZX(IX))
+             STEMP = STEMP + DCABS1(ZX(I))
-           IX = IX + INCX
+          END DO
-CONTINUE
+       END IF
        DZASUM = STEMP
        RETURN
  *
- *        code for increment equal to 1
+ *     End of DZASUM
  *
-DO 30 I = 1,N
-           STEMP = STEMP + DCABS1(ZX(I))
-CONTINUE
-       DZASUM = STEMP
-       RETURN
        END

CVSweb interface <joel.bertrand@systella.fr>

Removed from v.1.3
changed lines
	Added in v.1.17