SUBROUTINE ZSCAL(N,ZA,ZX,INCX) * .. Scalar Arguments .. DOUBLE COMPLEX ZA INTEGER INCX,N * .. * .. Array Arguments .. DOUBLE COMPLEX ZX(*) * .. * * Purpose * ======= * * ZSCAL scales a vector by a constant. * * Further Details * =============== * * jack dongarra, 3/11/78. * modified 3/93 to return if incx .le. 0. * modified 12/3/93, array(1) declarations changed to array(*) * * ===================================================================== * * .. Local Scalars .. INTEGER I,IX * .. IF (N.LE.0 .OR. INCX.LE.0) RETURN IF (INCX.EQ.1) GO TO 20 * * code for increment not equal to 1 * IX = 1 DO 10 I = 1,N ZX(IX) = ZA*ZX(IX) IX = IX + INCX 10 CONTINUE RETURN * * code for increment equal to 1 * 20 DO 30 I = 1,N ZX(I) = ZA*ZX(I) 30 CONTINUE RETURN END