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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 #include <shogun/features/SimpleFeatures.h>
00017
00018 using namespace shogun;
00019
00020 CChebyshewMetric::CChebyshewMetric() : CSimpleDistance<float64_t>()
00021 {
00022 }
00023
00024 CChebyshewMetric::CChebyshewMetric(CSimpleFeatures<float64_t>* l, CSimpleFeatures<float64_t>* r)
00025 : CSimpleDistance<float64_t>()
00026 {
00027 init(l, r);
00028 }
00029
00030 CChebyshewMetric::~CChebyshewMetric()
00031 {
00032 cleanup();
00033 }
00034
00035 bool CChebyshewMetric::init(CFeatures* l, CFeatures* r)
00036 {
00037 return CSimpleDistance<float64_t>::init(l,r);
00038 }
00039
00040 void CChebyshewMetric::cleanup()
00041 {
00042 }
00043
00044 float64_t CChebyshewMetric::compute(int32_t idx_a, int32_t idx_b)
00045 {
00046 int32_t alen, blen;
00047 bool afree, bfree;
00048
00049 float64_t* avec=
00050 ((CSimpleFeatures<float64_t>*) lhs)->get_feature_vector(idx_a, alen, afree);
00051 float64_t* bvec=
00052 ((CSimpleFeatures<float64_t>*) rhs)->get_feature_vector(idx_b, blen, bfree);
00053
00054 ASSERT(alen==blen);
00055
00056 float64_t result=DBL_MIN;
00057
00058 for (int32_t i=0; i<alen; i++)
00059 result=CMath::max(result, fabs(avec[i]-bvec[i]));
00060
00061 ((CSimpleFeatures<float64_t>*) lhs)->free_feature_vector(avec, idx_a, afree);
00062 ((CSimpleFeatures<float64_t>*) rhs)->free_feature_vector(bvec, idx_b, bfree);
00063
00064 return result;
00065 }