#include "header.h"

//Preforms the summation part of the desired equation.
// return double	Returns the result of the summation of funks.
// vector * vecin	The vector to preform the funk upon
// vector * f		The vector to store the partially completed maths in.



double sumfunk(vector * vecin, vector * f)
//vecin should have size n, f should have size n-2;
{
	int n = vecin->size, i = 0;
	double result = 0;

	for (i=0; i<n-2; i++)
	{
		//We store the results of this calculatoin in f
		//Incase we wish to reassemble it elsewhere
		f->elements[i] = funk(   vecin->elements[i],
					vecin->elements[i+1],
					vecin->elements[i+2]);
		result  += f->elements[i];
	}
	return result;
}