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    1: *> \brief \b ZSCAL
    2: *
    3: *  =========== DOCUMENTATION ===========
    4: *
    5: * Online html documentation available at 
    6: *            http://www.netlib.org/lapack/explore-html/ 
    7: *
    8: *  Definition:
    9: *  ===========
   10: *
   11: *       SUBROUTINE ZSCAL(N,ZA,ZX,INCX)
   12: * 
   13: *       .. Scalar Arguments ..
   14: *       COMPLEX*16 ZA
   15: *       INTEGER INCX,N
   16: *       ..
   17: *       .. Array Arguments ..
   18: *       COMPLEX*16 ZX(*)
   19: *       ..
   20: *  
   21: *
   22: *> \par Purpose:
   23: *  =============
   24: *>
   25: *> \verbatim
   26: *>
   27: *>    ZSCAL scales a vector by a constant.
   28: *> \endverbatim
   29: *
   30: *  Authors:
   31: *  ========
   32: *
   33: *> \author Univ. of Tennessee 
   34: *> \author Univ. of California Berkeley 
   35: *> \author Univ. of Colorado Denver 
   36: *> \author NAG Ltd. 
   37: *
   38: *> \date November 2011
   39: *
   40: *> \ingroup complex16_blas_level1
   41: *
   42: *> \par Further Details:
   43: *  =====================
   44: *>
   45: *> \verbatim
   46: *>
   47: *>     jack dongarra, 3/11/78.
   48: *>     modified 3/93 to return if incx .le. 0.
   49: *>     modified 12/3/93, array(1) declarations changed to array(*)
   50: *> \endverbatim
   51: *>
   52: *  =====================================================================
   53:       SUBROUTINE ZSCAL(N,ZA,ZX,INCX)
   54: *
   55: *  -- Reference BLAS level1 routine (version 3.4.0) --
   56: *  -- Reference BLAS is a software package provided by Univ. of Tennessee,    --
   57: *  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
   58: *     November 2011
   59: *
   60: *     .. Scalar Arguments ..
   61:       COMPLEX*16 ZA
   62:       INTEGER INCX,N
   63: *     ..
   64: *     .. Array Arguments ..
   65:       COMPLEX*16 ZX(*)
   66: *     ..
   67: *
   68: *  =====================================================================
   69: *
   70: *     .. Local Scalars ..
   71:       INTEGER I,NINCX
   72: *     ..
   73:       IF (N.LE.0 .OR. INCX.LE.0) RETURN
   74:       IF (INCX.EQ.1) THEN
   75: *
   76: *        code for increment equal to 1
   77: *
   78:          DO I = 1,N
   79:             ZX(I) = ZA*ZX(I)
   80:          END DO
   81:       ELSE
   82: *
   83: *        code for increment not equal to 1
   84: *
   85:          NINCX = N*INCX
   86:          DO I = 1,NINCX,INCX
   87:             ZX(I) = ZA*ZX(I)
   88:          END DO
   89:       END IF
   90:       RETURN
   91:       END