L2范数 squareNorm()，等价于计算vector的自身点积，norm()返回squareNorm的开方根。

这些操作应用于matrix，norm() 会返回Frobenius或Hilbert-Schmidt范数。

如果你想使用其他Lp范数，可以使用lpNorm< p >()方法。p可以取Infinity，表示L∞范数

int main()
{
  VectorXf v(2);
  MatrixXf m(2,2), n(2,2);
  
  v << -1,
       2;
  
  m << 1,-2,
       -3,4;
  cout << "v.squaredNorm() = " << v.squaredNorm() << endl;
  cout << "v.norm() = " << v.norm() << endl;
  cout << "v.lpNorm<1>() = " << v.lpNorm<1>() << endl;
  cout << "v.lpNorm<Infinity>() = " << v.lpNorm<Infinity>() << endl;
  cout << endl;
  cout << "m.squaredNorm() = " << m.squaredNorm() << endl;
  cout << "m.norm() = " << m.norm() << endl;
  cout << "m.lpNorm<1>() = " << m.lpNorm<1>() << endl;
  cout << "m.lpNorm<Infinity>() = " << m.lpNorm<Infinity>() << endl;
}