MATLAB: Find the closest co-ordinates (between to uneven list of cooardinates)

euclidean distancesfind indexknnsearchpdist2Statistics and Machine Learning Toolbox

I want to select the coordinates in PointinCh1 list which have a coordinates in PointinCh2 list close to them. The code that I am suing at the moment is creating a list called 'closestForPin2toPin1', which is not helpful in finding the indexes in PointinCh1 .
Your help will be appreciated
 PointinCh1 = 
    20   482
    19   359
    45   438
    61   248
    90   403
   104    95
   149   335
   148   392
   161    73
   186    29
   188   236
   189   319
   200   162
   208    70
   204   198
   203   343
   214   250
   225   307
   233   171
   238   205
   237   245
   253   148
   264   362
   281    34
   300   341
   306    88
   305   203
   328   234
   326   164
   330    20
   364   199
   424   241
   433   314
   491   187
PointinCh2 = 
    99   399
   104    95
   149   335
   148   392
   158    82
   184   238
   190   320
   202   343
   236   246
   263   361
   299   342
   330    20
   493   193
%compute Euclidean distances:
for idis=1: length(PointinCh1)
distances = sqrt(sum(bsxfun(@minus, PointinCh2, PointinCh1(idis,:)).^2,2));
%find the smallest distance and use that as an index into B:
closestForPin2toPin1(idis,:)= PointinCh2(find(distances==min(distances)),:);
end

Best Answer

Read about inbuilt function knnsearch .
http://in.mathworks.com/help/stats/knnsearch.html
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