dlapy3.f.html

来自「famous linear algebra library (LAPACK) p」· HTML 代码 · 共 79 行

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<pre>
      DOUBLE PRECISION FUNCTION <a name="DLAPY3.1"></a><a href="dlapy3.f.html#DLAPY3.1">DLAPY3</a>( X, Y, Z )
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  -- LAPACK auxiliary routine (version 3.1) --
</span><span class="comment">*</span><span class="comment">     Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd..
</span><span class="comment">*</span><span class="comment">     November 2006
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">     .. Scalar Arguments ..
</span>      DOUBLE PRECISION   X, Y, Z
<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="DLAPY3.14"></a><a href="dlapy3.f.html#DLAPY3.1">DLAPY3</a> returns sqrt(x**2+y**2+z**2), taking care not to cause
</span><span class="comment">*</span><span class="comment">  unnecessary overflow.
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  Arguments
</span><span class="comment">*</span><span class="comment">  =========
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  X       (input) DOUBLE PRECISION
</span><span class="comment">*</span><span class="comment">  Y       (input) DOUBLE PRECISION
</span><span class="comment">*</span><span class="comment">  Z       (input) DOUBLE PRECISION
</span><span class="comment">*</span><span class="comment">          X, Y and Z specify the values x, y and z.
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  =====================================================================
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">     .. Parameters ..
</span>      DOUBLE PRECISION   ZERO
      PARAMETER          ( ZERO = 0.0D0 )
<span class="comment">*</span><span class="comment">     ..
</span><span class="comment">*</span><span class="comment">     .. Local Scalars ..
</span>      DOUBLE PRECISION   W, XABS, YABS, ZABS
<span class="comment">*</span><span class="comment">     ..
</span><span class="comment">*</span><span class="comment">     .. Intrinsic Functions ..
</span>      INTRINSIC          ABS, MAX, SQRT
<span class="comment">*</span><span class="comment">     ..
</span><span class="comment">*</span><span class="comment">     .. Executable Statements ..
</span><span class="comment">*</span><span class="comment">
</span>      XABS = ABS( X )
      YABS = ABS( Y )
      ZABS = ABS( Z )
      W = MAX( XABS, YABS, ZABS )
      IF( W.EQ.ZERO ) THEN
<span class="comment">*</span><span class="comment">     W can be zero for max(0,nan,0)
</span><span class="comment">*</span><span class="comment">     adding all three entries together will make sure
</span><span class="comment">*</span><span class="comment">     NaN will not disappear.
</span>         <a name="DLAPY3.47"></a><a href="dlapy3.f.html#DLAPY3.1">DLAPY3</a> =  XABS + YABS + ZABS
      ELSE
         <a name="DLAPY3.49"></a><a href="dlapy3.f.html#DLAPY3.1">DLAPY3</a> = W*SQRT( ( XABS / W )**2+( YABS / W )**2+
     $            ( ZABS / W )**2 )
      END IF
      RETURN
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">     End of <a name="DLAPY3.54"></a><a href="dlapy3.f.html#DLAPY3.1">DLAPY3</a>
</span><span class="comment">*</span><span class="comment">
</span>      END

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