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#include <Eigen/Dense>
#include <iostream>
using namespace std;
using namespace Eigen;
int main()
{
VectorXf v(6);
v << 1, 2, 3, 4, 5, 6;
//print first three elements
cout << "-- head(3) --" << endl
<< v.head(3) << endl << endl;
//print last three elements
cout << "-- tail(3) --" << endl
<< v.tail(3) << endl << endl;
//print between 2nd and 5th elem. inclusive
cout << "-- segment(1,4) --" << endl
<< v.segment(1,4) << endl;
}
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