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<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="asecd" xml:lang="ja">

    <refnamediv>

        <refname>asecd</refname>

        <refpurpose>

            引数の要素毎の逆割線を計算し,結果を度単位で返す.

        </refpurpose>

    </refnamediv>

    <refsynopsisdiv>

        <title>呼び出し手順</title>

        <synopsis>y = asecd(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>

            引数の要素毎の逆割線を計算し,結果を度単位で返します.

            絶対値が <literal>1</literal>より大きい実数入力データの

            場合, 結果は実数で <literal>[-90 90]</literal>の範囲となります.

        </para>

        <para>

            <literal>asecd(x)</literal> は

            <literal>asec(x)*180/%pi</literal>と等価です.

        </para>

    </refsection>

    <refsection>

        <title>サンプル</title>

        <scilab:image>

            x=linspace(1,20,200);

            x=[-x($:-1:1) %nan x];

            plot(x,asecd(x))



        </scilab:image>

    </refsection>

    <refsection>

        <title>例</title>

        <programlisting role="example"><![CDATA[
x=[1 2 -2 sqrt(2) -sqrt(2) 2/sqrt(3) -2/sqrt(3) -1];
asecd(x)
 ]]></programlisting>

    </refsection>

    <refsection role="see also">

        <title>参照</title>

        <simplelist type="inline">

            <member>

                <link linkend="asec">asec</link>

            </member>

            <member>

                <link linkend="secd">secd</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>

