SUBROUTINE CSCAL(N,CA,CX,INCX) * .. Scalar Arguments .. COMPLEX CA INTEGER INCX,N * .. * .. Array Arguments .. COMPLEX CX(*) * .. * * Purpose * ======= * * scales a vector by a constant. * jack dongarra, linpack, 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,NINCX * .. IF (N.LE.0 .OR. INCX.LE.0) RETURN IF (INCX.EQ.1) GO TO 20 * * code for increment not equal to 1 * NINCX = N*INCX DO 10 I = 1,NINCX,INCX CX(I) = CA*CX(I) 10 CONTINUE RETURN * * code for increment equal to 1 * 20 DO 30 I = 1,N CX(I) = CA*CX(I) 30 CONTINUE RETURN END