zswap.f.html

来自「famous linear algebra library (LAPACK) p」· HTML 代码 · 共 70 行

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<pre>
      SUBROUTINE <a name="ZSWAP.1"></a><a href="zswap.f.html#ZSWAP.1">ZSWAP</a>(N,ZX,INCX,ZY,INCY)
<span class="comment">*</span><span class="comment">     .. Scalar Arguments ..
</span>      INTEGER INCX,INCY,N
<span class="comment">*</span><span class="comment">     ..
</span><span class="comment">*</span><span class="comment">     .. Array Arguments ..
</span>      DOUBLE COMPLEX ZX(*),ZY(*)
<span class="comment">*</span><span class="comment">     ..
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  Purpose
</span><span class="comment">*</span><span class="comment">  =======
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">     interchanges two vectors.
</span><span class="comment">*</span><span class="comment">     jack dongarra, 3/11/78.
</span><span class="comment">*</span><span class="comment">     modified 12/3/93, array(1) declarations changed to array(*)
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">     .. Local Scalars ..
</span>      DOUBLE COMPLEX ZTEMP
      INTEGER I,IX,IY
<span class="comment">*</span><span class="comment">     ..
</span>      IF (N.LE.0) RETURN
      IF (INCX.EQ.1 .AND. INCY.EQ.1) GO TO 20
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">       code for unequal increments or equal increments not equal
</span><span class="comment">*</span><span class="comment">         to 1
</span><span class="comment">*</span><span class="comment">
</span>      IX = 1
      IY = 1
      IF (INCX.LT.0) IX = (-N+1)*INCX + 1
      IF (INCY.LT.0) IY = (-N+1)*INCY + 1
      DO 10 I = 1,N
          ZTEMP = ZX(IX)
          ZX(IX) = ZY(IY)
          ZY(IY) = ZTEMP
          IX = IX + INCX
          IY = IY + INCY
   10 CONTINUE
      RETURN
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">       code for both increments equal to 1
</span>   20 DO 30 I = 1,N
          ZTEMP = ZX(I)
          ZX(I) = ZY(I)
          ZY(I) = ZTEMP
   30 CONTINUE
      RETURN
      END

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