Thread: I have no idea what's wrong with this vector implementation

I have no idea what's wrong with following code.

Code:

//yada, yada, the usual include files
using namespace std;

typedef unsigned int UINT;

const UINT BUFMAX = 1024;
const UINT CHARMAX = 32;
const UINT ARRMAX = 32;
const double EHTA = 0.3;
const double THRESHOLD = 1.0;

template <class T1, class T2>
double GetPrediction(vector<T1>& v1, vector<T2>& v2)
{
	//v1 is passed as type vector<double>, v2 as type vector<int>
	vector<T1> result(v1);

	/*error occurs in the next line. I tried using C type casts, e.g. (double), 
	and I tried leaving it alone so there would be no type conversion: result[0] = v2[0]. 
	Nothing works. They all throw an error such as: 
	c:\perceptron\perceptron.cpp(28): error C2440: '=' : cannot convert from 
	'std::allocator<_Ty>::value_type' to 'std::allocator<_Ty>::value_type'
        with
        [
            _Ty=std::vector<int>
        ]
        and
        [
            _Ty=double
        ] */

	result[0] = static_cast<double>(v2[0]);

	/* If I comment out the above line. It gets even weirder. 
	The error occurs in <algorithm> as follows: 
	c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\algorithm(401): error C2664: 
	'double std::multiplies<_Ty>::operator ()(const _Ty &,const _Ty &) const' : 
	cannot convert parameter 1 from 'std::allocator<_Ty>::value_type' to 'const double &'
        with
        [
            _Ty=double
        ]
        and
        [
            _Ty=std::vector<int>
        ]
        Reason: cannot convert from 'std::allocator<_Ty>::value_type' to 'const double'
        with
        [
            _Ty=std::vector<int>
        ] */
	transform(v2.begin() + 1, v2.end(), result.begin() + 1, result.begin() + 1, multiplies<double>());
	return accumulate(result.begin() + 1, result.end(), 0) > THRESHOLD ? 1.0 : -1.0;
}

template <class T1, class T2>
void GetWeightVector(vector<T1>& vw, vector<vector<T2> >& vi)
{
	//vw is passed as a vector<double> from main(). vi is vector<int>.
	double t;
  for(UINT i = 0; i < vi.size(); i++)
  {
	  t = 0.3 * (vi[i][0] - GetPrediction(vw, vi));
	  vector<T1> result(vw);
	  transform(result.begin(), result.end(), result.begin(), bind2nd(multiplies<double>(), t));
	  transform(result.begin(), result.end(), vw.begin(), vw.begin(), minus<double>());
  }
}

// main() comes after

Argghhhhhh! I've been staring it this thing for hours and I still don't know how to fix it.