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1 | #include <Eigen/Dense>
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2 | #include <iostream>
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3 |
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4 | using namespace Eigen;
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5 | using namespace std;
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6 |
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7 | int main(int, char**)
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8 | {
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9 | cout.precision(3);
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10 | SelfAdjointEigenSolver<Matrix4f> es;
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11 | Matrix4f X = Matrix4f::Random(4,4);
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12 | Matrix4f A = X + X.transpose();
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13 | es.compute(A);
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14 | cout << "The eigenvalues of A are: " << es.eigenvalues().transpose() << endl;
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15 | es.compute(A + Matrix4f::Identity(4,4)); // re-use es to compute eigenvalues of A+I
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16 | cout << "The eigenvalues of A+I are: " << es.eigenvalues().transpose() << endl;
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17 |
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18 | return 0;
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19 | }
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