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    1:       SUBROUTINE ZSCAL(N,ZA,ZX,INCX)
    2: *     .. Scalar Arguments ..
    3:       DOUBLE COMPLEX ZA
    4:       INTEGER INCX,N
    5: *     ..
    6: *     .. Array Arguments ..
    7:       DOUBLE COMPLEX ZX(*)
    8: *     ..
    9: *
   10: *  Purpose
   11: *  =======
   12: *
   13: *     ZSCAL scales a vector by a constant.
   14: *
   15: *  Further Details
   16: *  ===============
   17: *
   18: *     jack dongarra, 3/11/78.
   19: *     modified 3/93 to return if incx .le. 0.
   20: *     modified 12/3/93, array(1) declarations changed to array(*)
   21: *
   22: *  =====================================================================
   23: *
   24: *     .. Local Scalars ..
   25:       INTEGER I,NINCX
   26: *     ..
   27:       IF (N.LE.0 .OR. INCX.LE.0) RETURN
   28:       IF (INCX.EQ.1) THEN
   29: *
   30: *        code for increment equal to 1
   31: *
   32:          DO I = 1,N
   33:             ZX(I) = ZA*ZX(I)
   34:          END DO
   35:       ELSE
   36: *
   37: *        code for increment not equal to 1
   38: *
   39:          NINCX = N*INCX
   40:          DO I = 1,NINCX,INCX
   41:             ZX(I) = ZA*ZX(I)
   42:          END DO
   43:       END IF
   44:       RETURN
   45:       END