convert linalg library from Fortran to C++

lib/linalg/fortran/zdscal.f

@@ -0,0 +1,123 @@
+*> \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 ..
+      COMPLEX*16 ZX(*)
+*     ..
+*
+*  =====================================================================
+*
+*     .. Local Scalars ..
+      INTEGER I,NINCX
+*     .. Parameters ..
+      DOUBLE PRECISION ONE
+      PARAMETER (ONE=1.0D+0)
+*     ..
+*     .. Intrinsic Functions ..
+      INTRINSIC DBLE, DCMPLX, DIMAG
+*     ..
+      IF (N.LE.0 .OR. INCX.LE.0 .OR. DA.EQ.ONE) RETURN
+      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
+*
+         NINCX = N*INCX
+         DO I = 1,NINCX,INCX
+            ZX(I) = DCMPLX(DA*DBLE(ZX(I)),DA*DIMAG(ZX(I)))
+         END DO
+      END IF
+      RETURN
+*
+*     End of ZDSCAL
+*
+      END