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¡¡¡¡K×î½üÁÚ(k-Nearest Neighbor£¬KNN)·ÖÀàËã·¨£¬ÊÇÒ»¸öÀíÂÛÉϱȽϳÉÊìµÄ·½·¨£¬Ò²ÊÇ×î¼òµ¥µÄ»úÆ÷ѧϰËã·¨Ö®Ò»¡£¸Ã·½·¨µÄ˼·ÊÇ£ºÈç¹ûÒ»¸öÑù±¾ÔÚÌØÕ÷¿Õ¼äÖеÄk¸ö×îÏàËÆ(¼´ÌØÕ÷¿Õ¼äÖÐ×îÁÚ½ü)µÄÑù±¾ÖеĴó¶àÊýÊôÓÚijһ¸öÀà±ð£¬Ôò¸ÃÑù±¾Ò²ÊôÓÚÕâ¸öÀà±ð¡£KNNËã·¨ÖУ¬ËùÑ¡ÔñµÄÁÚ¾Ó¶¼ÊÇÒѾ­ÕýÈ··ÖÀàµÄ¶ÔÏ󡣸÷½·¨ÔÚ¶¨Àà¾ö²ßÉÏÖ»ÒÀ¾Ý×îÁÚ½üµÄÒ»¸ö»òÕß¼¸¸öÑù±¾µÄÀà±ðÀ´¾ö¶¨´ý·ÖÑù±¾ËùÊôµÄÀà±ð¡£ KNN·½·¨ËäÈ»´ÓÔ­ÀíÉÏÒ²ÒÀÀµÓÚ¼«ÏÞ¶¨Àí£¬µ«ÔÚÀà±ð¾ö²ßʱ£¬Ö»Ó뼫ÉÙÁ¿µÄÏàÁÚÑù±¾Óйء£ÓÉÓÚKNN·½·¨Ö÷Òª¿¿ÖÜΧÓÐÏÞµÄÁÚ½üµÄÑù±¾£¬¶ø²»ÊÇ¿¿ÅбðÀàÓòµÄ·½·¨À´È·¶¨ËùÊôÀà±ðµÄ£¬Òò´Ë¶ÔÓÚÀàÓòµÄ½»²æ»òÖØµþ½Ï¶àµÄ´ý·ÖÑù±¾¼¯À´Ëµ£¬KNN·½·¨½ÏÆäËû·½·¨¸üΪÊʺϡ£

¡¡¡¡KNNËã·¨²»½ö¿ÉÒÔÓÃÓÚ·ÖÀ࣬»¹¿ÉÒÔÓÃÓڻع顣ͨ¹ýÕÒ³öÒ»¸öÑù±¾µÄk¸ö×î½üÁÚ¾Ó£¬½«ÕâЩÁÚ¾ÓµÄÊôÐÔµÄÆ½¾ùÖµ¸³¸ø¸ÃÑù±¾£¬¾Í¿ÉÒԵõ½¸ÃÑù±¾µÄÊôÐÔ¡£¸üÓÐÓõķ½·¨Êǽ«²»Í¬¾àÀëµÄÁÚ¾Ó¶Ô¸ÃÑù±¾²úÉúµÄÓ°Ïì¸øÓ費ͬµÄȨֵ(weight)£¬ÈçȨֵÓë¾àÀë³ÉÕý±È¡£

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KNN-Ö÷ÒªÓ¦ÓÃÁìÓò
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ÎÒµÄkNN·ÖÀàËã·¨³ÌÐò£º




------------------- Code written by Stephen Liu -----------------------

#include
#include
#define MAX 1000
using namespace std;
int m, i, j;
int types[100];
class str
{
public:
  float x;
  float y;
  float distance;
  int type;
};
str data[ MAX ];//ÊäÈëµÄÒÑÖªÀà±ðµÄÊý¾Ý
str point;//ÐèÒª¸ù¾ÝkNNÅжÏÀà±ðµÄδ֪Êý¾Ý
str temp;

void input_data()
{
cout << "ÇëÊäÈëÒÑÖªµãµÄ¸öÊý£º";
cin >> m;
for ( i = 1; i <= m; i++)
{
  cout <<"ÇëÊäÈëµã " << i  <<"  µÄ×ø±êx , y ºÍËùÊôÀà±ð£º" ;
  cin >> data.x >> data.y >> data.type;
}
}


void Distance()//¼ÆËãδ֪Àà±ðµãÓëËùÓÐÒÑÖªÀà±ðµãµÄ¾àÀë
{
for ( i = 1; i <= m; i++ )
  data.distance = sqrt  (  (data.x - point.x) * (data.x - point.x) + (data.y - point.y) * (data.y - point.y) );
}

void sort()//¶Ô¾àÀë½øÐдÓСµ½´óÅÅÐò
{
for( i = 1; i <= m; i++)
  for(j = m; j > i; j--)
  {
   if(data[ j ].distance  < data[ j - 1 ].distance)
   {
    temp=data[ j ];
    data[ j ]=data[ j - 1 ];
    data[ j - 1]=temp;
   }
  }
}

int kNN( )
{
int the_type,num = 0, k;
cout <<"ÇëÊäÈëkNNµÄkÖµ£º";
cin >> k;
for ( i = 1; i <= 99; i++)
  types[ i ] = 0;
for ( i = 1; i <= k; i++)//¶ÔÒÑÅÅÐòµÄǰkλ¾àÀëÀà±ð½øÐÐͳ¼Æ
  types[ data.type ] ++;
for ( i = 1; i <= 99; i++)//ÕÒ³öδ֪Àà±ðµãÊôÓÚµÄÀà±ð
{
  if (types > num )
  {
   num = types;
   the_type = i;
  }
}
return ( the_type);
}

int main()
{
input_data();
cout <<"ÇëÊäÈëδ֪Àà±ðµãµÄ×ø±êx,y£¨ÊäÈë0 0Í˳ö)£º";
cin >> point.x >> point.y;
do
{
  Distance();
  sort();
  cout <<"µã( " << point.x << " , " << point.y <<" )ÊôÓÚÀà"<<  kNN() << endl;
  cout <<"ÇëÊäÈëδ֪Àà±ðµãµÄ×ø±êx,y£¨ÊäÈë0 0Í˳ö)£º";
  cin >> point.x >> point.y;
}
while ( point.x != 0 && point.y != 0);
cout <<"======= kNN·ÖÀàËã·¨ Stephen Liu  E-mail:stephenliu1989@163.com   2010.8 ======= ";
system("pause";
return 0;
}


------------------------- Code end ---------------------------------

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stephenliu89

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stephenliu89

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Originally posted by stephenliu89 at 2010-09-05 11:15:37:
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stephenliu89

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Originally posted by yalefield at 2010-09-05 16:57:35:
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