e144b86b4c559b2453ad60db1bfdac9dd6ec8095
[scilab.git] / scilab / modules / elementary_functions / help / ja_JP / discrete / rat.xml
1     <?xml version="1.0" encoding="UTF-8"?>
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13     <refentry xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:svg="http://www.w3.org/2000/svg" xmlns:ns5="http://www.w3.org/1999/xhtml" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:db="http://docbook.org/ns/docbook" xmlns:scilab="http://www.scilab.org" xml:id="rat" xml:lang="ja">
14         <refnamediv>
15             <refname>rat</refname>
16             <refpurpose>浮動小数点数の有理数近似</refpurpose>
17         </refnamediv>
18         <refsynopsisdiv>
19             <title>呼び出し手順</title>
20             <synopsis>[N,D]=rat(x [,tol])
21                 y=rat(x [,tol])
22             </synopsis>
23         </refsynopsisdiv>
24         <refsection>
25             <title>パラメータ</title>
26             <variablelist>
27                 <varlistentry>
28                     <term>x</term>
29                     <listitem>
30                         <para>実数のベクトルまたは行列</para>
31                     </listitem>
32                 </varlistentry>
33                 <varlistentry>
34                     <term>n</term>
35                     <listitem>
36                         <para>整数のベクトルまたは行列</para>
37                     </listitem>
38                 </varlistentry>
39                 <varlistentry>
40                     <term>d</term>
41                     <listitem>
42                         <para>整数のベクトルまたは行列</para>
43                     </listitem>
44                 </varlistentry>
45                 <varlistentry>
46                     <term>y</term>
47                     <listitem>
48                         <para>実数のベクトルまたは行列</para>
49                     </listitem>
50                 </varlistentry>
51             </variablelist>
52         </refsection>
53         <refsection>
54             <title>説明</title>
55             <para>
56                 <literal>[N,D] = rat(x,tol)</literal> は,
57                 <literal>abs(N./D - X) &lt;= tol*abs(x)</literal>の意味で
58                 <literal>N./D</literal>が<literal>x</literal>に近くなるような
59                 2つの整数行列を返します.
60                 有理数近似は分数展開を丸めることにより生成されます.
61                 デフォルトは
62                 <literal>tol = 1.e-6*norm(X,1)</literal> です. <literal>y =
63                     rat(x,tol)
64                 </literal>
65                 は商 <literal>N./D</literal>を返します.
66             </para>
67         </refsection>
68         <refsection>
69             <title>例</title>
70             <programlisting role="example"><![CDATA[ 
71 [n,d]=rat(%pi)
72 [n,d]=rat(%pi,1.d-12)
73 n/d-%pi
74  ]]></programlisting>
75         </refsection>
76         <refsection role="see also">
77             <title>参照</title>
78             <simplelist type="inline">
79                 <member>
80                     <link linkend="int">int</link>
81                 </member>
82                 <member>
83                     <link linkend="round">round</link>
84                 </member>
85             </simplelist>
86         </refsection>
87     </refentry>