cdotu.f.html

来自「famous linear algebra library (LAPACK) p」· HTML 代码 · 共 74 行

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<pre>
      COMPLEX FUNCTION <a name="CDOTU.1"></a><a href="cdotu.f.html#CDOTU.1">CDOTU</a>(N,CX,INCX,CY,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>      COMPLEX CX(*),CY(*)
<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">     <a name="CDOTU.12"></a><a href="cdotu.f.html#CDOTU.1">CDOTU</a> forms the dot product of two vectors.
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  Further Details
</span><span class="comment">*</span><span class="comment">  ===============
</span><span class="comment">*</span><span class="comment">
</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">     .. Local Scalars ..
</span>      COMPLEX CTEMP
      INTEGER I,IX,IY
<span class="comment">*</span><span class="comment">     ..
</span>      CTEMP = (0.0,0.0)
      <a name="CDOTU.25"></a><a href="cdotu.f.html#CDOTU.1">CDOTU</a> = (0.0,0.0)
      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
</span><span class="comment">*</span><span class="comment">          not equal 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
          CTEMP = CTEMP + CX(IX)*CY(IY)
          IX = IX + INCX
          IY = IY + INCY
   10 CONTINUE
      <a name="CDOTU.41"></a><a href="cdotu.f.html#CDOTU.1">CDOTU</a> = CTEMP
      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
          CTEMP = CTEMP + CX(I)*CY(I)
   30 CONTINUE
      <a name="CDOTU.49"></a><a href="cdotu.f.html#CDOTU.1">CDOTU</a> = CTEMP
      RETURN
      END

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