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2840ac7e94
* renaming, e.g. LU ---> FullPivLU * split tests framework: more robust, e.g. dont generate empty tests if a number is skipped * make all remaining tests use that splitting, as needed. * Fix 4x4 inversion (see stable branch) * Transform::inverse() and geo_transform test : adapt to new inverse() API, it was also trying to instantiate inverse() for 3x4 matrices. * CMakeLists: more robust regexp to parse the version number * misc fixes in unit tests
21 lines
859 B
C++
21 lines
859 B
C++
typedef Matrix<double, 5, 3> Matrix5x3;
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typedef Matrix<double, 5, 5> Matrix5x5;
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Matrix5x3 m = Matrix5x3::Random();
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cout << "Here is the matrix m:" << endl << m << endl;
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Eigen::FullPivLU<Matrix5x3> lu(m);
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cout << "Here is, up to permutations, its LU decomposition matrix:"
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<< endl << lu.matrixLU() << endl;
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cout << "Here is the L part:" << endl;
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Matrix5x5 l = Matrix5x5::Identity();
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l.block<5,3>(0,0).part<StrictlyLowerTriangular>() = lu.matrixLU();
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cout << l << endl;
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cout << "Here is the U part:" << endl;
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Matrix5x3 u = lu.matrixLU().part<UpperTriangular>();
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cout << u << endl;
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cout << "Let us now reconstruct the original matrix m:" << endl;
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Matrix5x3 x = l * u;
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Matrix5x3 y;
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for(int i = 0; i < 5; i++) for(int j = 0; j < 3; j++)
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y(i, lu.permutationQ()[j]) = x(lu.permutationP()[i], j);
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cout << y << endl; // should be equal to the original matrix m
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