DOUBLE COMPLEX FUNCTION ZDOTU(N,ZX,INCX,ZY,INCY)
INTEGER INCX,INCY,N
DOUBLE COMPLEX ZX(*),ZY(*)
DOUBLE COMPLEX ZTEMP
INTEGER I,IX,IY
ZTEMP = (0.0d0,0.0d0)
ZDOTU = (0.0d0,0.0d0)
IF (N.LE.0) RETURN
IF (INCX.EQ.1 .AND. INCY.EQ.1) GO TO 20
IX = 1
IY = 1
IF (INCX.LT.0) IX = (-N+1)*INCX + 1
IF (INCY.LT.0) IY = (-N+1)*INCY + 1
DO 10 I = 1,N
ZTEMP = ZTEMP + ZX(IX)*ZY(IY)
IX = IX + INCX
IY = IY + INCY
10 CONTINUE
ZDOTU = ZTEMP
RETURN
20 DO 30 I = 1,N
ZTEMP = ZTEMP + ZX(I)*ZY(I)
30 CONTINUE
ZDOTU = ZTEMP
RETURN
END