EuclidianDistance.cpp
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00011 #include "lib/common.h"
00012 #include "lib/io.h"
00013 #include "distance/EuclidianDistance.h"
00014 #include "features/Features.h"
00015 #include "features/RealFeatures.h"
00016
00017 CEuclidianDistance::CEuclidianDistance()
00018 : CRealDistance()
00019 {
00020 disable_sqrt=false;
00021 }
00022
00023 CEuclidianDistance::CEuclidianDistance(CRealFeatures* l, CRealFeatures* r)
00024 : CRealDistance()
00025 {
00026 disable_sqrt=false;
00027 init(l, r);
00028 }
00029
00030 CEuclidianDistance::~CEuclidianDistance()
00031 {
00032 cleanup();
00033 }
00034
00035 bool CEuclidianDistance::init(CFeatures* l, CFeatures* r)
00036 {
00037 CRealDistance::init(l, r);
00038
00039 return true;
00040 }
00041
00042 void CEuclidianDistance::cleanup()
00043 {
00044 }
00045
00046 bool CEuclidianDistance::load_init(FILE* src)
00047 {
00048 return false;
00049 }
00050
00051 bool CEuclidianDistance::save_init(FILE* dest)
00052 {
00053 return false;
00054 }
00055
00056 DREAL CEuclidianDistance::compute(INT idx_a, INT idx_b)
00057 {
00058 INT alen, blen;
00059 bool afree, bfree;
00060 DREAL result=0;
00061
00062 DREAL* avec=((CRealFeatures*) lhs)->get_feature_vector(idx_a, alen, afree);
00063 DREAL* bvec=((CRealFeatures*) rhs)->get_feature_vector(idx_b, blen, bfree);
00064 ASSERT(alen==blen);
00065
00066 for (INT i=0; i<alen; i++)
00067 result+=CMath::sq(avec[i] - bvec[i]);
00068
00069 ((CRealFeatures*) lhs)->free_feature_vector(avec, idx_a, afree);
00070 ((CRealFeatures*) rhs)->free_feature_vector(bvec, idx_b, bfree);
00071
00072 if (disable_sqrt) {
00073 return result;
00074 } else {
00075 return CMath::sqrt(result);
00076 }
00077 }