rpl/lapack/blas/idamax.f - diff

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

-version 1.3, 2010/08/06 15:32:20
+version 1.17, 2020/05/21 21:45:55
  Line 1
+ *> \brief \b IDAMAX
+ *
+ *  =========== DOCUMENTATION ===========
+ *
+ * Online html documentation available at
+ *            http://www.netlib.org/lapack/explore-html/
+ *
+ *  Definition:
+ *  ===========
+ *
+ *       INTEGER FUNCTION IDAMAX(N,DX,INCX)
+ *
+ *       .. Scalar Arguments ..
+ *       INTEGER INCX,N
+ *       ..
+ *       .. Array Arguments ..
+ *       DOUBLE PRECISION DX(*)
+ *       ..
+ *
+ *
+ *> \par Purpose:
+ *  =============
+ *>
+ *> \verbatim
+ *>
+ *>    IDAMAX finds the index of the first element having maximum absolute value.
+ *> \endverbatim
+ *
+ *  Arguments:
+ *  ==========
+ *
+ *> \param[in] N
+ *> \verbatim
+ *>          N is INTEGER
+ *>         number of elements in input vector(s)
+ *> \endverbatim
+ *>
+ *> \param[in] DX
+ *> \verbatim
+ *>          DX is DOUBLE PRECISION array, dimension ( 1 + ( N - 1 )*abs( INCX ) )
+ *> \endverbatim
+ *>
+ *> \param[in] INCX
+ *> \verbatim
+ *>          INCX is INTEGER
+ *>         storage spacing between elements of DX
+ *> \endverbatim
+ *
+ *  Authors:
+ *  ========
+ *
+ *> \author Univ. of Tennessee
+ *> \author Univ. of California Berkeley
+ *> \author Univ. of Colorado Denver
+ *> \author NAG Ltd.
+ *
+ *> \date November 2017
+ *
+ *> \ingroup aux_blas
+ *
+ *> \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
+ *>
+ *  =====================================================================
        INTEGER FUNCTION IDAMAX(N,DX,INCX)
+ *
+ *  -- Reference BLAS level1 routine (version 3.8.0) --
+ *  -- Reference BLAS is a software package provided by Univ. of Tennessee,    --
+ *  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
+ *     November 2017
+ *
  *     .. Scalar Arguments ..
        INTEGER INCX,N
  *     ..
- Line 6
+ Line 83
        DOUBLE PRECISION DX(*)
  *     ..
  *
- *  Purpose
- *  =======
- *
- *     IDAMAX finds the index of element having max. absolute value.
- *
- *  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(*)
- *
  *  =====================================================================
  *
  *     .. Local Scalars ..
- Line 31
+ Line 96
        IF (N.LT.1 .OR. INCX.LE.0) RETURN
        IDAMAX = 1
        IF (N.EQ.1) RETURN
-       IF (INCX.EQ.1) GO TO 20
+       IF (INCX.EQ.1) THEN
  *
- *        code for increment not equal to 1
+ *        code for increment equal to 1
  *
-       IX = 1
+          DMAX = DABS(DX(1))
-       DMAX = DABS(DX(1))
+          DO I = 2,N
-       IX = IX + INCX
+             IF (DABS(DX(I)).GT.DMAX) THEN
-       DO 10 I = 2,N
+                IDAMAX = I
-           IF (DABS(DX(IX)).LE.DMAX) GO TO 5
+                DMAX = DABS(DX(I))
-           IDAMAX = I
+             END IF
-           DMAX = DABS(DX(IX))
+          END DO
-    IX = IX + INCX
+       ELSE
-CONTINUE
-       RETURN
  *
- *        code for increment equal to 1
+ *        code for increment not equal to 1
  *
-DMAX = DABS(DX(1))
+          IX = 1
-       DO 30 I = 2,N
+          DMAX = DABS(DX(1))
-           IF (DABS(DX(I)).LE.DMAX) GO TO 30
+          IX = IX + INCX
-           IDAMAX = I
+          DO I = 2,N
-           DMAX = DABS(DX(I))
+             IF (DABS(DX(IX)).GT.DMAX) THEN
-CONTINUE
+                IDAMAX = I
+                DMAX = DABS(DX(IX))
+             END IF
+             IX = IX + INCX
+          END DO
+       END IF
        RETURN
        END

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