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@r9y9(Ryuichi Yamamoto)

C++の行列ライブラリEigenで逆行列を求めるときの注意

Last updated at Posted at 2013-09-27

Eigen/LUもinclude しないとだめ。Eigen/Coreに逆行列 .inverse()と行列式 .determinant() は入ってない

# include <Eigen/Core>
# include <Eigen/LU>

cannot find xxx.inverse()/determinant() みたいな親切なエラーメッセージは出てこないので、意外とハマった。templateのエラー読むのつらい

過去に二回くらいはまってる気がする

Eigenって何 → http://eigen.tuxfamily.org/index.php?title=Main_Page

2013/09/27 補足：

現実的なケースでは、逆行列を求めるのに.inverse()は使わず、LU分解なりQR分解なりを使います
http://eigen.tuxfamily.org/dox/group__TutorialLinearAlgebra.html

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