c++ - How to call function defined in template -

i'm in process of trying find polynomial regression set of x , y data. downloaded template below so, have no idea how call it, , attempts met error lnk2019: unresolved external symbol.

#pragma once  #ifdef boost_ublas_type_check #   undef boost_ublas_type_check #endif #define boost_ublas_type_check 0 #ifndef _use_math_defines #   define _use_math_defines #endif  #include <boost/numeric/ublas/matrix.hpp> #include <boost/numeric/ublas/lu.hpp> #include <vector> #include <stdexcept>  /* finds coefficients of polynomial p(x) of degree n fits data,  p(x(i)) y(i), in least squares sense. result p row vector of  length n+1 containing polynomial coefficients in incremental powers.  param:     ox              x axis values     oy              y axis values     ndegree         polynomial degree including constant  return:     coefficients of polynomial starting @ constant coefficient ,     ending coefficient of power ndegree. c++0x-compatible      compilers make returning locally created vectors efficient.  */ template<typename t> std::vector<t> polyfit( const std::vector<t>& ox,  const std::vector<t>& oy, int ndegree ) { ... } 

i don't think ya'll need rest of template me out, post if necessary. (it's site http://vilipetek.com/2013/10/07/polynomial-fitting-in-c-using-boost/) if there's better/easier tool out there, let me know it.

this how tried run it: declaration

std::vector<int> polyfit( const std::vector<int> xsplinevector,                     const std::vector<int> ysplinevector,  

function call

polynomial = polyfit((xsplinevector), (ysplinevector), 4);                int ndegree ); 

here example:

#include <vector> #include <polyfit.hpp>  int main() {     std::vector<int> xsplinevector;     std::vector<int> ysplinevector;     std::vector<int> poly;      // fill both xsplinevector , ysplinevector      poly = polyfit(xsplinevector, ysplinevector, 4);  }