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I am using MatrixXd matrices from Eigen on my code, and at a certain point I need a 3D one. Since Eigen does not have tridimensional matrix types, as it is optimized just for linear algebra, instead I am creating a pointer array of the MatrixXd type: Eigen::MatrixXd *CVM =new Eigen::MatrixXd[100]; for (int i = 0; i < 100; i++){ CVM[i]= Eigen::MatrixXd::Zero(5,5); } However, later on I need to acess the values on this array, and for that I am doing something like: for (int k = 0; k < 100; k++){ Eigen::MatrixXd* b=&CVM[k]; for (int i = 0; i < 5; i++){ for (int j = 0; j < 5; j++){ b->coeff(i,j)=47; } } } As b is a pointer and not the MatrixXd itself, b(i,j) obviously wouldn't work, so instead I am using the coeff() method, however, I get the following error: error: assignment of read-only location ‘b->Eigen::Matrix<double, -1, -1>::<anonymous>.Eigen::PlainObjectBase<Derived>::coeff<Eigen::Matrix<double, -1, -1> >(((Eigen::PlainObjectBase<Eigen::Matrix<double, -1, -1> >::Index)i), ((Eigen::PlainObjectBase<Eigen::Matrix<double, -1, -1> >::Index)j))’ EDIT: output added cout << b << endl; cout << CVM[47] << endl; 0x1c34b00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

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