48 lines
1.0 KiB
FortranFixed
48 lines
1.0 KiB
FortranFixed
SUBROUTINE CSSCAL(N,SA,CX,INCX)
|
|
* .. Scalar Arguments ..
|
|
REAL SA
|
|
INTEGER INCX,N
|
|
* ..
|
|
* .. Array Arguments ..
|
|
COMPLEX CX(*)
|
|
* ..
|
|
*
|
|
* Purpose
|
|
* =======
|
|
*
|
|
* CSSCAL scales a complex vector by a real constant.
|
|
*
|
|
* Further Details
|
|
* ===============
|
|
*
|
|
* 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
|
|
* ..
|
|
* .. Intrinsic Functions ..
|
|
INTRINSIC AIMAG,CMPLX,REAL
|
|
* ..
|
|
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) = CMPLX(SA*REAL(CX(I)),SA*AIMAG(CX(I)))
|
|
10 CONTINUE
|
|
RETURN
|
|
*
|
|
* code for increment equal to 1
|
|
*
|
|
20 DO 30 I = 1,N
|
|
CX(I) = CMPLX(SA*REAL(CX(I)),SA*AIMAG(CX(I)))
|
|
30 CONTINUE
|
|
RETURN
|
|
END
|