somtoolbox2/som_sub2ind.m
4dbef185
 function inds = som_sub2ind(msize,Subs)
 
 %SOM_SUB2IND Linear index from map grid subscripts.
 %
 % ind = som_sub2ind(msize,Subs)
 %
 %  ind = som_sub2ind([10 15],[4 5]);
 %  ind = som_sub2ind(sMap,[4 5]);
 %  ind = som_sub2ind(sMap.msize,[4 5]);
 %  inds = som_sub2ind([10 15],[4 5; 3 2; 1 10]);
 %
 %  Input and output arguments: 
 %   msize  (struct) map or topology struct
 %          (vector) size 1 x m, specifies the map grid size
 %   Subs   (matrix) size n x m, the subscripts of n vectors
 %
 %   inds   (vector) size n x 1, corresponding linear indeces
 %
 % See also SOM_IND2SUB.
 
 % Contributed to SOM Toolbox vs2, February 2nd, 2000 by Juha Vesanto
 % http://www.cis.hut.fi/projects/somtoolbox/
 
 % juuso 300798
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
 if isstruct(msize), 
   if strcmp(msize.type,'som_map'), msize = msize.topol.msize; 
   elseif strcmp(msize.type,'som_topol'), msize = msize.msize;
   else error('Invalid first argument.'); end
 end
 
 % check off-limits
 [n d] = size(Subs);
 offl = find(Subs < 1 | Subs > msize(ones(n,1),1:d)); 
 Subs(offl) = NaN;
 
 % indexes
 k = [1 cumprod(msize(1:end-1))]';
 inds = 1 + (Subs-1)*k;
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%