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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 | typedef Matrix<float,1,Dynamic> MatrixType;
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11 | typedef Map<MatrixType> MapType;
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12 | typedef Map<const MatrixType> MapTypeConst; // a read-only map
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13 | const int n_dims = 5;
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14 |
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15 | MatrixType m1(n_dims), m2(n_dims);
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16 | m1.setRandom();
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17 | m2.setRandom();
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18 | float *p = &m2(0); // get the address storing the data for m2
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19 | MapType m2map(p,m2.size()); // m2map shares data with m2
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20 | MapTypeConst m2mapconst(p,m2.size()); // a read-only accessor for m2
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21 |
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22 | cout << "m1: " << m1 << endl;
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23 | cout << "m2: " << m2 << endl;
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24 | cout << "Squared euclidean distance: " << (m1-m2).squaredNorm() << endl;
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25 | cout << "Squared euclidean distance, using map: " <<
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26 | (m1-m2map).squaredNorm() << endl;
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27 | m2map(3) = 7; // this will change m2, since they share the same array
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28 | cout << "Updated m2: " << m2 << endl;
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29 | cout << "m2 coefficient 2, constant accessor: " << m2mapconst(2) << endl;
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30 | /* m2mapconst(2) = 5; */ // this yields a compile-time error
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31 |
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32 | return 0;
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33 | }
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