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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 | MatrixXcd X = MatrixXcd::Random(4,4);
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11 | MatrixXcd A = X + X.adjoint();
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12 | cout << "Here is a random self-adjoint 4x4 matrix:" << endl << A << endl << endl;
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13 |
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14 | Tridiagonalization<MatrixXcd> triOfA(A);
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15 | MatrixXd T = triOfA.matrixT();
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16 | cout << "The tridiagonal matrix T is:" << endl << T << endl << endl;
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17 |
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18 | cout << "We can also extract the diagonals of T directly ..." << endl;
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19 | VectorXd diag = triOfA.diagonal();
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20 | cout << "The diagonal is:" << endl << diag << endl;
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21 | VectorXd subdiag = triOfA.subDiagonal();
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22 | cout << "The subdiagonal is:" << endl << subdiag << endl;
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23 |
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24 | return 0;
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25 | }
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