L2Distance.cpp

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#include "L2Distance.h"

namespace damina
{
        L2Distance::L2Distance() {
                
        }

        L2Distance::~L2Distance() {
        
        }

        double L2Distance::calculateDistance(struct svm_node *x, struct svm_node *y) {
                double sum = 0;
                while(x->index != -1 && y->index !=-1)
                {
                        if(x->index == y->index)
                        {
                                double d = x->value - y->value;
                                sum += d*d;
                                ++x;
                                ++y;
                        }
                        else
                        {
                                if(x->index > y->index)
                                {       
                                        sum += y->value * y->value;
                                        ++y;
                                }
                                else
                                {
                                        sum += x->value * x->value;
                                        ++x;
                                }
                        }
                }

                while(x->index != -1)
                {
                        sum += x->value * x->value;
                        ++x;
                }

                while(y->index != -1)
                {
                        sum += y->value * y->value;
                        ++y;
                }
                return (sum > 0.0 ? sum: 0.0);
        }
}

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