source: trunk/src/tps_eval.m @ 273

Last change on this file since 273 was 273, checked in by sommeria, 9 years ago

GUI civ renovated with panels

File size: 893 bytes
Line 
1%   EM:     MxN matrix whose i,j position contains the Euclidean
2%              distance between the i-th data site and j-th center
3  function EM = tps_eval(dsites,ctrs)
4  [M,s] = size(dsites); [N,s] = size(ctrs);
5  EM = zeros(M,N);
6 
7  % calculate distance matrix: accumulate sum of squares of coordinate differences
8  % The ndgrid command produces two MxN matrices:
9  %   Dsite, consisting of N identical columns (each containing
10  %       the d-th coordinate of the M data sites)
11  %   Ctrs, consisting of M identical rows (each containing
12  %       the d-th coordinate of the N centers)
13  for d=1:s
14     [Dsites,Ctrs] = ndgrid(dsites(:,d),ctrs(:,d));
15     EM = EM + (Dsites-Ctrs).^2;%EM=square of distance matrices
16  end
17
18  % calculate tps
19  np=find(EM~=0);
20  EM(np) = EM(np).*log(EM(np))/2;%= tps formula r^2 log(r) (EM=r^2)
21 
22  % add linear gradient part:
23  EM = [EM ones(M,1) dsites];
Note: See TracBrowser for help on using the repository browser.