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| 1 | typedef Matrix<float,1,Dynamic> MatrixType;
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| 2 | typedef Map<MatrixType> MapType;
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| 3 | typedef Map<const MatrixType> MapTypeConst; // a read-only map
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| 4 | const int n_dims = 5;
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| 5 |
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| 6 | MatrixType m1(n_dims), m2(n_dims);
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| 7 | m1.setRandom();
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| 8 | m2.setRandom();
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| 9 | float *p = &m2(0); // get the address storing the data for m2
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| 10 | MapType m2map(p,m2.size()); // m2map shares data with m2
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| 11 | MapTypeConst m2mapconst(p,m2.size()); // a read-only accessor for m2
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| 12 |
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| 13 | cout << "m1: " << m1 << endl;
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| 14 | cout << "m2: " << m2 << endl;
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| 15 | cout << "Squared euclidean distance: " << (m1-m2).squaredNorm() << endl;
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| 16 | cout << "Squared euclidean distance, using map: " <<
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| 17 | (m1-m2map).squaredNorm() << endl;
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| 18 | m2map(3) = 7; // this will change m2, since they share the same array
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| 19 | cout << "Updated m2: " << m2 << endl;
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| 20 | cout << "m2 coefficient 2, constant accessor: " << m2mapconst(2) << endl;
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| 21 | /* m2mapconst(2) = 5; */ // this yields a compile-time error
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