diff options
Diffstat (limited to 'doc/snippets/class_FullPivLU.cpp')
-rw-r--r-- | doc/snippets/class_FullPivLU.cpp | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/doc/snippets/class_FullPivLU.cpp b/doc/snippets/class_FullPivLU.cpp new file mode 100644 index 000000000..fce7fac09 --- /dev/null +++ b/doc/snippets/class_FullPivLU.cpp @@ -0,0 +1,16 @@ +typedef Matrix<double, 5, 3> Matrix5x3; +typedef Matrix<double, 5, 5> Matrix5x5; +Matrix5x3 m = Matrix5x3::Random(); +cout << "Here is the matrix m:" << endl << m << endl; +Eigen::FullPivLU<Matrix5x3> lu(m); +cout << "Here is, up to permutations, its LU decomposition matrix:" + << endl << lu.matrixLU() << endl; +cout << "Here is the L part:" << endl; +Matrix5x5 l = Matrix5x5::Identity(); +l.block<5,3>(0,0).triangularView<StrictlyLower>() = lu.matrixLU(); +cout << l << endl; +cout << "Here is the U part:" << endl; +Matrix5x3 u = lu.matrixLU().triangularView<Upper>(); +cout << u << endl; +cout << "Let us now reconstruct the original matrix m:" << endl; +cout << lu.permutationP().inverse() * l * u * lu.permutationQ().inverse() << endl; |