Annotation of rpl/lapack/blas/zswap.f, revision 1.1
1.1 ! bertrand 1: SUBROUTINE ZSWAP(N,ZX,INCX,ZY,INCY)
! 2: * .. Scalar Arguments ..
! 3: INTEGER INCX,INCY,N
! 4: * ..
! 5: * .. Array Arguments ..
! 6: DOUBLE COMPLEX ZX(*),ZY(*)
! 7: * ..
! 8: *
! 9: * Purpose
! 10: * =======
! 11: *
! 12: * ZSWAP interchanges two vectors.
! 13: *
! 14: * Further Details
! 15: * ===============
! 16: *
! 17: * jack dongarra, 3/11/78.
! 18: * modified 12/3/93, array(1) declarations changed to array(*)
! 19: *
! 20: * =====================================================================
! 21: *
! 22: * .. Local Scalars ..
! 23: DOUBLE COMPLEX ZTEMP
! 24: INTEGER I,IX,IY
! 25: * ..
! 26: IF (N.LE.0) RETURN
! 27: IF (INCX.EQ.1 .AND. INCY.EQ.1) GO TO 20
! 28: *
! 29: * code for unequal increments or equal increments not equal
! 30: * to 1
! 31: *
! 32: IX = 1
! 33: IY = 1
! 34: IF (INCX.LT.0) IX = (-N+1)*INCX + 1
! 35: IF (INCY.LT.0) IY = (-N+1)*INCY + 1
! 36: DO 10 I = 1,N
! 37: ZTEMP = ZX(IX)
! 38: ZX(IX) = ZY(IY)
! 39: ZY(IY) = ZTEMP
! 40: IX = IX + INCX
! 41: IY = IY + INCY
! 42: 10 CONTINUE
! 43: RETURN
! 44: *
! 45: * code for both increments equal to 1
! 46: 20 DO 30 I = 1,N
! 47: ZTEMP = ZX(I)
! 48: ZX(I) = ZY(I)
! 49: ZY(I) = ZTEMP
! 50: 30 CONTINUE
! 51: RETURN
! 52: END
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