<?xml version="1.0" encoding="UTF-8"?>
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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:mml="http://www.w3.org/1998/Math/MathML" xmlns:db="http://docbook.org/ns/docbook" xmlns:scilab="http://www.scilab.org" xml:lang="ru" xml:id="isfield">
    <refnamediv>
        <refname>isfield</refname>
        <refpurpose>проверяет: существует ли поле с указанным именем в структуре</refpurpose>
    </refnamediv>
    <refsynopsisdiv>
        <title>Синтаксис</title>
        <synopsis>bool = isfield(s, fieldname)</synopsis>
    </refsynopsisdiv>
    <refsection>
        <title>Аргументы</title>
        <variablelist>
            <varlistentry>
                <term>s</term>
                <listitem>
                    <para>массив структуры.</para>
                </listitem>
            </varlistentry>
            <varlistentry>
                <term>fieldname</term>
                <listitem>
                    <para>матрица строк.</para>
                </listitem>
            </varlistentry>
            <varlistentry>
                <term>bool</term>
                <listitem>
                    <para>матрица логических значений.</para>
                </listitem>
            </varlistentry>
        </variablelist>
    </refsection>
    <refsection>
        <title>Описание</title>
        <para>
            Эта функция возвращает <constant>%t</constant>, если указанная
            структура <varname>s</varname> содержит поле с именем <varname>fieldname</varname>, не взирая на его значение.
        </para>
    </refsection>
    <refsection>
        <title>Примеры</title>
        <programlisting role="example"><![CDATA[
s = struct("field_1",123,"field_2",456,"field_4",789)

// Single Fieldname Syntax
isfield( s , "field_1"  )

// Multiple Fieldname Syntax
isfield( s , [ "field_1" "field_2" ; "field_3" "field_4" ] )
 ]]></programlisting>
    </refsection>
    <refsection role="see also">
        <title>Смотрите также</title>
        <simplelist type="inline">
            <member>
                <link linkend="struct">struct</link>
            </member>
            <member>
                <link linkend="getfield">getfield</link>
            </member>
            <member>
                <link linkend="definedfields">definedfields</link>
            </member>
        </simplelist>
    </refsection>
</refentry>
