BitMagicC++Library
sample9.cpp

Example demonstrates binary distance metrics. BM library can compute various distances without materializing a product set.

See also
bm::count_and
bm::count_xor
bm::count_sub
bm::count_or
bm::distance_operation

For more information please visit: http://bmagic.sourceforge.net

/*
Copyright(c) 2002-2017 Anatoliy Kuznetsov(anatoliy_kuznetsov at yahoo.com)
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
For more information please visit: http://bitmagic.io
*/
/** \example sample9.cpp
Example demonstrates binary distance metrics. BM library can compute
various distances without materializing a product set.
\sa bm::count_and
\sa bm::count_xor
\sa bm::count_sub
\sa bm::count_or
\sa bm::distance_operation
For more information please visit: http://bmagic.sourceforge.net
*/
#include <iostream>
#include "bm.h"
#include "bmalgo.h"
using namespace std;
int main(void)
{
try
{
bv1[10] = true;
bv1[100] = true;
bv1[10000] = true;
bv2[10] = true;
bv2[100] = true;
bv2[20000] = true;
bv2[30000] = true;
// Hamming distance:
unsigned hamming = bm::count_xor(bv1, bv2);
cout << "Hamming distance = " << hamming << endl;
// Dice distance using basic distance functions
double dice =
double(2 * bm::count_and(bv1, bv2))/double(bv1.count() + bv2.count());
cout << "Dice distance = " << dice << endl;
// Dice distance, can be computed using "metric pipeline"
dmd[1].metric = bm::COUNT_A;
dmd[2].metric = bm::COUNT_B;
bm::distance_operation(bv1, bv2, dmd, dmd+3);
double dice_p =
double(2 * dmd[0].result) / double(dmd[1].result + dmd[2].result);
cout << "Dice distance (pipeline) = " << dice_p << endl;
}
catch(std::exception& ex)
{
std::cerr << ex.what() << std::endl;
return 1;
}
return 0;
}