Go to the documentation of this file.00001
00002
00003
00004
00005
00006
00007
00008
00009
00010
00011 #include "lib/common.h"
00012 #include "lib/io.h"
00013 #include "distance/EuclidianDistance.h"
00014 #include "features/Features.h"
00015 #include "features/SimpleFeatures.h"
00016
00017 using namespace shogun;
00018
00019 CEuclidianDistance::CEuclidianDistance()
00020 : CRealDistance()
00021 {
00022 disable_sqrt=false;
00023 }
00024
00025 CEuclidianDistance::CEuclidianDistance(CSimpleFeatures<float64_t>* l, CSimpleFeatures<float64_t>* r)
00026 : CRealDistance()
00027 {
00028 disable_sqrt=false;
00029 init(l, r);
00030 }
00031
00032 CEuclidianDistance::~CEuclidianDistance()
00033 {
00034 cleanup();
00035 }
00036
00037 bool CEuclidianDistance::init(CFeatures* l, CFeatures* r)
00038 {
00039 CRealDistance::init(l, r);
00040
00041 return true;
00042 }
00043
00044 void CEuclidianDistance::cleanup()
00045 {
00046 }
00047
00048 float64_t CEuclidianDistance::compute(int32_t idx_a, int32_t idx_b)
00049 {
00050 int32_t alen, blen;
00051 bool afree, bfree;
00052 float64_t result=0;
00053
00054 float64_t* avec=((CSimpleFeatures<float64_t>*) lhs)->
00055 get_feature_vector(idx_a, alen, afree);
00056 float64_t* bvec=((CSimpleFeatures<float64_t>*) rhs)->
00057 get_feature_vector(idx_b, blen, bfree);
00058 ASSERT(alen==blen);
00059
00060 for (int32_t i=0; i<alen; i++)
00061 result+=CMath::sq(avec[i] - bvec[i]);
00062
00063 ((CSimpleFeatures<float64_t>*) lhs)->free_feature_vector(avec, idx_a, afree);
00064 ((CSimpleFeatures<float64_t>*) rhs)->free_feature_vector(bvec, idx_b, bfree);
00065
00066 if (disable_sqrt) {
00067 return result;
00068 } else {
00069 return CMath::sqrt(result);
00070 }
00071 }