<?xml version="1.0" encoding="utf-8"?>
<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="acsc" xml:lang="ja">
    <refnamediv>
        <refname>acsc</refname>
        <refpurpose>引数の逆余割を要素毎に計算する.</refpurpose>
    </refnamediv>
    <refsynopsisdiv>
        <title>呼び出し手順</title>
        <synopsis>y = acsc(x)</synopsis>
    </refsynopsisdiv>
    <refsection>
        <title>引数</title>
        <variablelist>
            <varlistentry>
                <term>x</term>
                <listitem>
                    <para>実数または複素数の配列.</para>
                </listitem>
            </varlistentry>
            <varlistentry>
                <term>y</term>
                <listitem>
                    <para>実数または複素数の配列.</para>
                </listitem>
            </varlistentry>
        </variablelist>
    </refsection>
    <refsection>
        <title>説明</title>
        <para>
            引数の逆余割を要素毎に計算します.
            絶対値が1より大きい実数引数の場合,結果は実数となります.
        </para>
        <para>
            以下の等式が成り立ちます: <code>acsc(z) == -acsc(-z) ==
                asin(1/z) == %pi/2-asec(z) == %i*acsch(%i*z)
            </code>
        </para>
    </refsection>
    <refsection>
        <title>サンプル</title>
        <scilab:image>
            x=linspace(1,20,200);
            x=[-x($:-1:1) %nan x];
            plot(x,acsc(x))
        </scilab:image>
    </refsection>
    <refsection>
        <title>例</title>
        <programlisting role="example"><![CDATA[
x=linspace(1,20,200);
x=[-x($:-1:1) %nan x];
plot(x,acsc(x))
 ]]></programlisting>
    </refsection>
    <refsection role="see also">
        <title>参照</title>
        <simplelist type="inline">
            <member>
                <link linkend="acscd">acscd</link>
            </member>
            <member>
                <link linkend="csc">csc</link>
            </member>
            <member>
                <link linkend="cscd">cscd</link>
            </member>
            <member>
                <link linkend="acsch">acsch</link>
            </member>
        </simplelist>
    </refsection>
    <refsection>
        <title>参考文献</title>
        <simplelist type="vert">
            <member>Kahan, W., "Branch cuts for complex elementary functions, or,
                Much ado about nothing's sign bit", Proceedings of the joing IMA/SIAM
                conference on The State of the Art in Numerical Analysis, University of
                Birmingham, A. Iserles and M.J.D. Powell, eds, Clarendon Press, Oxford,
                1987, 165-210.
            </member>
        </simplelist>
    </refsection>
</refentry>