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1 | #include <iostream>
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2 | #include <Eigen/Dense>
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3 |
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4 | using namespace std;
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5 | using namespace Eigen;
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6 |
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7 | int main()
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8 | {
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9 | Eigen::MatrixXf m(2,4);
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10 | Eigen::VectorXf v(2);
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11 |
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12 | m << 1, 23, 6, 9,
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13 | 3, 11, 7, 2;
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14 |
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15 | v << 2,
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16 | 3;
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17 |
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18 | MatrixXf::Index index;
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19 | // find nearest neighbour
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20 | (m.colwise() - v).colwise().squaredNorm().minCoeff(&index);
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21 |
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22 | cout << "Nearest neighbour is column " << index << ":" << endl;
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23 | cout << m.col(index) << endl;
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24 | }
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