COMPLEX FUNCTION CDOTU(N,CX,INCX,CY,INCY) * .. Scalar Arguments .. INTEGER INCX,INCY,N * .. * .. Array Arguments .. COMPLEX CX(*),CY(*) * .. * * Purpose * ======= * * CDOTU forms the dot product of two vectors. * * Further Details * =============== * * jack dongarra, linpack, 3/11/78. * modified 12/3/93, array(1) declarations changed to array(*) * * ===================================================================== * * .. Local Scalars .. COMPLEX CTEMP INTEGER I,IX,IY * .. CTEMP = (0.0,0.0) CDOTU = (0.0,0.0) IF (N.LE.0) RETURN IF (INCX.EQ.1 .AND. INCY.EQ.1) GO TO 20 * * 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 10 I = 1,N CTEMP = CTEMP + CX(IX)*CY(IY) IX = IX + INCX IY = IY + INCY 10 CONTINUE CDOTU = CTEMP RETURN * * code for both increments equal to 1 * 20 DO 30 I = 1,N CTEMP = CTEMP + CX(I)*CY(I) 30 CONTINUE CDOTU = CTEMP RETURN END