eigen/doc/snippets/Matrix_Map_stride.cpp

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Matrix4i A;
A << 1, 2, 3, 4,
5, 6, 7, 8,
9, 10, 11, 12,
13, 14, 15, 16;
std::cout << Matrix2i::Map(&A(1,1),Stride<8,2>()) << std::endl;