eigen/doc/snippets/Tutorial_ReshapeMat2Mat.cpp

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MatrixXf M1(2,6); // Column-major storage
M1 << 1, 2, 3, 4, 5, 6,
7, 8, 9, 10, 11, 12;
Map<MatrixXf> M2(M1.data(), 6,2);
cout << "M2:" << endl << M2 << endl;