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00011 #include <shogun/lib/config.h>
00012 #include <shogun/lib/common.h>
00013 #include <shogun/io/SGIO.h>
00014 #include <shogun/distance/ChebyshewMetric.h>
00015 #include <shogun/features/Features.h>
00016
00017 using namespace shogun;
00018
00019 CChebyshewMetric::CChebyshewMetric() : CDenseDistance<float64_t>()
00020 {
00021 }
00022
00023 CChebyshewMetric::CChebyshewMetric(CDenseFeatures<float64_t>* l, CDenseFeatures<float64_t>* r)
00024 : CDenseDistance<float64_t>()
00025 {
00026 init(l, r);
00027 }
00028
00029 CChebyshewMetric::~CChebyshewMetric()
00030 {
00031 cleanup();
00032 }
00033
00034 bool CChebyshewMetric::init(CFeatures* l, CFeatures* r)
00035 {
00036 return CDenseDistance<float64_t>::init(l,r);
00037 }
00038
00039 void CChebyshewMetric::cleanup()
00040 {
00041 }
00042
00043 float64_t CChebyshewMetric::compute(int32_t idx_a, int32_t idx_b)
00044 {
00045 int32_t alen, blen;
00046 bool afree, bfree;
00047
00048 float64_t* avec=
00049 ((CDenseFeatures<float64_t>*) lhs)->get_feature_vector(idx_a, alen, afree);
00050 float64_t* bvec=
00051 ((CDenseFeatures<float64_t>*) rhs)->get_feature_vector(idx_b, blen, bfree);
00052
00053 ASSERT(alen==blen);
00054
00055 float64_t result=DBL_MIN;
00056
00057 for (int32_t i=0; i<alen; i++)
00058 result=CMath::max(result, fabs(avec[i]-bvec[i]));
00059
00060 ((CDenseFeatures<float64_t>*) lhs)->free_feature_vector(avec, idx_a, afree);
00061 ((CDenseFeatures<float64_t>*) rhs)->free_feature_vector(bvec, idx_b, bfree);
00062
00063 return result;
00064 }