ground/gcs/src/libs/eigen/doc/snippets/SparseMatrix_coeffs.cpp

   1 SparseMatrix<double> A(3,3);
   2 A.insert(1,2) = 0;
   3 A.insert(0,1) = 1;
   4 A.insert(2,0) = 2;
   5 A.makeCompressed();
   6 cout << "The matrix A is:" << endl << MatrixXd(A) << endl;
   7 cout << "it has " << A.nonZeros() << " stored non zero coefficients that are: " << A.coeffs().transpose() << endl;
   8 A.coeffs() += 10;
   9 cout << "After adding 10 to every stored non zero coefficient, the matrix A is:" << endl << MatrixXd(A) << endl;