drot.f.html

来自「famous linear algebra library (LAPACK) p」· HTML 代码 · 共 72 行

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<pre>
      SUBROUTINE <a name="DROT.1"></a><a href="drot.f.html#DROT.1">DROT</a>(N,DX,INCX,DY,INCY,C,S)
<span class="comment">*</span><span class="comment">     .. Scalar Arguments ..
</span>      DOUBLE PRECISION C,S
      INTEGER INCX,INCY,N
<span class="comment">*</span><span class="comment">     ..
</span><span class="comment">*</span><span class="comment">     .. Array Arguments ..
</span>      DOUBLE PRECISION DX(*),DY(*)
<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">     applies a plane rotation.
</span><span class="comment">*</span><span class="comment">     jack dongarra, linpack, 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 PRECISION DTEMP
      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
          DTEMP = C*DX(IX) + S*DY(IY)
          DY(IY) = C*DY(IY) - S*DX(IX)
          DX(IX) = DTEMP
          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><span class="comment">*</span><span class="comment">
</span>   20 DO 30 I = 1,N
          DTEMP = C*DX(I) + S*DY(I)
          DY(I) = C*DY(I) - S*DX(I)
          DX(I) = DTEMP
   30 CONTINUE
      RETURN
      END

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