1 #include <Eigen/Dense>
2 #include <iostream>
3 
4 using namespace Eigen;
5 using namespace std;
6 
main()7 int main()
8 {
9   ArrayXXf a(3,3);
10   ArrayXXf b(3,3);
11   a << 1,2,3,
12        4,5,6,
13        7,8,9;
14   b << 1,2,3,
15        1,2,3,
16        1,2,3;
17 
18   // Adding two arrays
19   cout << "a + b = " << endl << a + b << endl << endl;
20 
21   // Subtracting a scalar from an array
22   cout << "a - 2 = " << endl << a - 2 << endl;
23 }
24