1 Matrix3d 
m = Matrix3d::Random();
 
    2 cout << 
"Here is the matrix m:" << endl << 
m << endl;
 
    7 cout << 
"Its determinant is " << 
determinant << endl;
 
    9   cout << 
"It is invertible, and its inverse is:" << endl << 
inverse << endl;
 
   12   cout << 
"It is not invertible." << endl;