function [attAffinity] = CalcAttributesAffinity(data, attData, last_known_node, addMissingAtt, normalize, returnSparse)
    n = size(attData,1);
    numAtt = size(attData,2);
    
    if addMissingAtt> 0 && last_known_node < n
        attData = AddMissingNodesAttrFromNeighborsNeighbors(data, attData, last_known_node, addMissingAtt);
    end
    
    count = sum(attData,2);
    nnz_n = nnz(count);
%    fprintf('calculating attribtes affinity matrix - common start\n');
    common = attData*attData';
    [r,c,v] = find(common);
    clear('common');
    x=size(r,1);
    LogMsg(sprintf('attAffinity common (%d) - nnz=%6.5d, %7.5d%%, max %d, min %d, mean %7.5d',numAtt,x,100*x/(n*n),max(v),min(v),mean(v)));
    LogMsg(sprintf('attAffinity count  (%d) - nnz=%6.5d, %7.5d%%, max %d, min %d, mean %7.5d',numAtt,nnz_n, 100*nnz_n/n, max(count),min(count),mean(count)));
    fprintf('calculating attribtes affinity matrix \n');
    
%    fprintf('calculating attribtes affinity matrix - loop start\n');
    attAffinity = zeros(n,n); %% Sigal 13.3.13 - TODO use sparse if x < 50%???
    for i=1:x
        total = count(r(i))+count(c(i))-v(i);
        if total > 0
            attAffinity(r(i),c(i)) = v(i)/total;
        end
    end
%     [r,c,v] = find(attAffinity);
%     x=size(r,1);
%     LogMsg(sprintf('attAffinity final -> nnz=%d, %d%%, max %d, min %d, mean %d',x,100*x/(n*n),max(v),min(v),mean(v)));
%     [r,c,v] = find(attAffinity>=0.02);
%     x=size(r,1);
%     LogMsg(sprintf('attAffinity 0.02 - nnz=%d, %d%%, max %d, min %d, mean %d',x,100*x/(n*n),max(v),min(v),mean(v)));
%     [r,c,v] = find(attAffinity>=0.05);
%     x=size(r,1);
%     LogMsg(sprintf('attAffinity 0.05 - nnz=%d, %d%%, max %d, min %d, mean %d',x,100*x/(n*n),max(v),min(v),mean(v)));

%    LogMsg(sprintf('==> attAffinity - max %d, min %d, mean %d',max(max(attAffinity)),min(min(attAffinity)),mean(mean(attAffinity))));
    
%     for i=1:n %% sigal 25.2.13 last_known_node
%         for j=1:i-1
%             if common(i,j)>0
%                 total = count(i)+count(j)-common(i,j);
%                 if total > 0
%                     attAffinity(i,j) = common(i,j)/total;
%                     attAffinity(j,i) = attAffinity(i,j);
%                 end
%             end
%         end
% %         for k=last_known_node+1:n
% %             attAffinity(i,k) = 1;
% %             attAffinity(k,i) = 1;
% %         end
%     end

%    fprintf('calculating attribtes affinity matrix - loop end\n');

%     fprintf('calculating attribtes affinity matrix - normalize start\n');
%     if normalize == 1
%         maxValue = max(max(attAffinity));
%         if maxValue>0 && maxValue ~= 1
%             attAffinity = attAffinity ./ maxValue;
%         end
%     end
%     fprintf('calculating attribtes affinity matrix - normalize end max=%d\n',maxValue);
% 
%     for i = 1 : size(attAffinity,1)
%         attAffinity(i,i) = 1;
%     end


%     if returnSparse == 1
%         attAffinity = sparse(attAffinity);
%     end
    fprintf('calculating attribtes affinity matrix - end function\n');

end %function