DOUBLE COMPLEX FUNCTION ZDOTC(N,ZX,INCX,ZY,INCY) * .. Scalar Arguments .. INTEGER INCX,INCY,N * .. * .. Array Arguments .. DOUBLE COMPLEX ZX(*),ZY(*) * .. * * Purpose * ======= * * ZDOTC forms the dot product of a vector. * * Further Details * =============== * * jack dongarra, 3/11/78. * modified 12/3/93, array(1) declarations changed to array(*) * * ===================================================================== * * .. Local Scalars .. DOUBLE COMPLEX ZTEMP INTEGER I,IX,IY * .. * .. Intrinsic Functions .. INTRINSIC DCONJG * .. ZTEMP = (0.0d0,0.0d0) ZDOTC = (0.0d0,0.0d0) IF (N.LE.0) RETURN IF (INCX.EQ.1 .AND. INCY.EQ.1) THEN * * code for both increments equal to 1 * DO I = 1,N ZTEMP = ZTEMP + DCONJG(ZX(I))*ZY(I) END DO ELSE * * code for unequal increments or equal increments * not equal to 1 * IX = 1 IY = 1 IF (INCX.LT.0) IX = (-N+1)*INCX + 1 IF (INCY.LT.0) IY = (-N+1)*INCY + 1 DO I = 1,N ZTEMP = ZTEMP + DCONJG(ZX(IX))*ZY(IY) IX = IX + INCX IY = IY + INCY END DO END IF ZDOTC = ZTEMP RETURN END