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Nearest neighbour algorithm

Posted on 2002-07-28
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Last Modified: 2010-03-31
Hi,

I'm trying to write a 'nearest neighbour algorithm' which basically finds a certain number of values in an array that are the closest to a certain value. For example, if I have an array of values:

18, 23, 22, 25, 20, 19, 18, 19, 25

I want to get the 6 values that have the least difference between the value 20. So in this case it would be the values:

18, 18, 19, 19, 22, 23

The first thing I did was to get the differences between each value and 20:

public void kneighbour(int[] values) {
         
  int number = values.length;
  float one = -1;
  float middle;
  float[] diff = new float[values.length];
           
  for(int i = 0; i< number; i++) {
     diff[i] = values[number/2] - values[i];
     if(diff[i] < 0) {
     diff[i] = diff[i]*one;
     }
    System.out.println("This difference is : " + diff[i]);
  }

Once I have all the differences how would I go about getting the six least differences??

Guster

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Question by:Guster
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5 Comments
 
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Expert Comment

by:klf
ID: 7183509
sort the differences in descending order.
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Accepted Solution

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PapaDanielle earned 50 total points
ID: 7183897
>>Once I have all the differences how would I go about
>> getting the six least differences??

sort the differences in ascending order , ie from least to greatest ...
0
 

Author Comment

by:Guster
ID: 7183927
how would I be able to relate those differences back to their original array values??
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Author Comment

by:Guster
ID: 7183934
I think I got it
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Expert Comment

by:PapaDanielle
ID: 7183982
OK. Glad to be of help.

Feel free to pass on any other prob.

Cheers

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