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

   1 MatrixXf mat(2,2);
   2 mat << 1, 2,  4, 7;
   3 cout << "Here is the matrix mat:\n" << mat << endl << endl;
   4
   5 mat = 2 * mat;
   6 cout << "After 'mat = 2 * mat', mat = \n" << mat << endl << endl;
   7
   8
   9 mat = mat - MatrixXf::Identity(2,2);
  10 cout << "After the subtraction, it becomes\n" << mat << endl << endl;
  11
  12
  13 ArrayXXf arr = mat;
  14 arr = arr.square();
  15 cout << "After squaring, it becomes\n" << arr << endl << endl;
  16
  17 // Combining all operations in one statement:
  18 mat << 1, 2,  4, 7;
  19 mat = (2 * mat - MatrixXf::Identity(2,2)).array().square();
  20 cout << "Doing everything at once yields\n" << mat << endl << endl;