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<?xml version="1.0" encoding="UTF-8"?>
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* Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
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* Copyright (C) 2008 - INRIA
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* This file must be used under the terms of the CeCILL.
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* This source file is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at
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* http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt
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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" version="5.0-subset Scilab" xml:lang="ja" xml:id="rcond">
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<refname>rcond</refname>
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<refpurpose>条件数の逆数</refpurpose>
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<synopsis>rcond(X)</synopsis>
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<para>実数または複素数の正方行列</para>
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<literal>rcond(X)</literal> は,1-ノルムにおける
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<literal>X</literal>の条件の逆数の推定値です.
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<literal>X</literal>が健全な場合,
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<literal>rcond(X)</literal> は 1 に近くなります.
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そうでない場合, <literal>rcond(X)</literal> は 0に近くなります.
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<literal>[r,z]=rcond(X)</literal> は
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<literal>r</literal>に<literal>rcond(X)</literal>を設定し,
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<literal>norm(X*z,1) = r*norm(X,1)*norm(z,1)</literal>となるような
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<literal>z</literal>を返します.
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つまり, <literal>rcond</literal> が小さい場合,
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<literal>z</literal> はカーネルのベクトルとなります.
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<programlisting role="example"><![CDATA[
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<refsection role="see also">
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<simplelist type="inline">
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<link linkend="svd">svd</link>
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<link linkend="cond">cond</link>
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<link linkend="inv">inv</link>