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Scilab manual >> Linear Algebra > rcond

rcond

条件数の逆数

呼び出し手順

rcond(X)

パラメータ

X

実数または複素数の正方行列

説明

rcond(X) は,1-ノルムにおける Xの条件の逆数の推定値です.

Xが健全な場合, rcond(X) は 1 に近くなります. そうでない場合, rcond(X) は 0に近くなります.

[r,z]=rcond(X)rrcond(X)を設定し, norm(X*z,1) = r*norm(X,1)*norm(z,1)となるような zを返します.

つまり, rcond が小さい場合, z はカーネルのベクトルとなります.

A=diag([1:10]);
rcond(A)
A(1,1)=0.000001;
rcond(A)

参照

<< rankqr Linear Algebra rowcomp >>

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