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En route pour la 4.0.15 !

    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