[Boost-users] copy(unit_vector.begin(), unit_vector.end(), vector.begin())

From: e r (erwann.rogard_at_[hidden])
Date: 2007-11-09 23:46:04

hi all,

i'm trying to assign a unit vector into a vector. i get puzzling  results:

v[3](0,0,0)//initial
uv1[3](1,0,0)
v[3](1,0,0)
uv2[3](0,1,0)
v[3](1,0,0)//should be (0,1,0)
uv3[3](0,1,0)
v[3](1,0,0)//should be (0,0,1)

for the code below. i must be missing something obvious...what is it?

#include <boost/numeric/ublas/vector.hpp>
#include <boost/numeric/ublas/io.hpp>

int main(){
        
        using namespace boost::numeric::ublas;
        
        unsigned int D = 3;
        unit_vector<unsigned int> uv1(D,0);
        unit_vector<unsigned int> uv2(D,1);
        unit_vector<unsigned int> uv3(D,2);
        vector<unsigned int> v(D);

        std::cout << "v"  << v << std::endl;
        
        copy(uv1.begin(),uv1.end(),v.begin());
        std::cout << "uv1"  << uv1 << std::endl;
        std::cout << "v"  << v << std::endl;
        copy(uv2.begin(),uv2.end(),v.begin());
        std::cout << "uv2"  << uv2 << std::endl;
        std::cout << "v"  << v << std::endl;
        copy(uv3.begin(),uv3.end(),v.begin());
        std::cout << "uv3"  << uv2 << std::endl;
        std::cout << "v"  << v << std::endl;
        
        return 0;
};