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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 | Matrix4d m = Vector4d(1,2,3,4).asDiagonal();
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11 | cout << "Here is the matrix m:" << endl << m << endl;
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12 | cout << "Here is m.fixed<2, 2>(2, 2):" << endl << m.block<2, 2>(2, 2) << endl;
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13 | m.block<2, 2>(2, 0) = m.block<2, 2>(2, 2);
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14 | cout << "Now the matrix m is:" << endl << m << endl;
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15 |
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16 | return 0;
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17 | }
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