eigen/doc/examples/Tutorial_ArrayClass_cwise_other.cpp

#include <Eigen/Dense>
#include <iostream>

using namespace Eigen;
using namespace std;

int main()
{
  ArrayXf a = ArrayXf::Random(5);
  a *= 2;
  cout << "a =" << endl 
       << a << endl;
  cout << "a.abs() =" << endl 
       << a.abs() << endl;
  cout << "a.abs().sqrt() =" << endl 
       << a.abs().sqrt() << endl;
  cout << "a.min(a.abs().sqrt()) =" << endl 
       << a.min(a.abs().sqrt()) << endl;
}