git-svn-id: svn://svn.icms.temple.edu/lammps-ro/trunk@9989 f3b2605a-c512-4ea7-a41b-209d697bcdaa

lib/linalg/dscal.f

@@ -1,4 +1,63 @@
+*> \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 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
@@ -7,19 +66,6 @@
       DOUBLE PRECISION DX(*)
 *     ..
 *
-*  Purpose
-*  =======
-*
-*     DSCAL scales a vector by a constant.
-*     uses unrolled loops for increment equal to one.
-*
-*  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 ..
@@ -29,34 +75,36 @@
       INTRINSIC MOD
 *     ..
       IF (N.LE.0 .OR. INCX.LE.0) RETURN
-      IF (INCX.EQ.1) GO TO 20
-*
-*        code for increment not equal to 1
-*
-      NINCX = N*INCX
-      DO 10 I = 1,NINCX,INCX
-          DX(I) = DA*DX(I)
-   10 CONTINUE
-      RETURN
+      IF (INCX.EQ.1) THEN
 *
 *        code for increment equal to 1
 *
 *
 *        clean-up loop
 *
-   20 M = MOD(N,5)
-      IF (M.EQ.0) GO TO 40
-      DO 30 I = 1,M
-          DX(I) = DA*DX(I)
-   30 CONTINUE
-      IF (N.LT.5) RETURN
-   40 MP1 = M + 1
-      DO 50 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)
-   50 CONTINUE
+         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