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      1 MatrixXf M1 = MatrixXf::Random(3,8);
      2 cout << "Column major input:" << endl << M1 << "\n";
      3 Map<MatrixXf,0,OuterStride<> > M2(M1.data(), M1.rows(), (M1.cols()+2)/3, OuterStride<>(M1.outerStride()*3));
      4 cout << "1 column over 3:" << endl << M2 << "\n";
      5 
      6 typedef Matrix<float,Dynamic,Dynamic,RowMajor> RowMajorMatrixXf;
      7 RowMajorMatrixXf M3(M1);
      8 cout << "Row major input:" << endl << M3 << "\n";
      9 Map<RowMajorMatrixXf,0,Stride<Dynamic,3> > M4(M3.data(), M3.rows(), (M3.cols()+2)/3,
     10                                               Stride<Dynamic,3>(M3.outerStride(),3));
     11 cout << "1 column over 3:" << endl << M4 << "\n";