Map attribute to categories
Use 0 for null/no value, 1 for unknown/private value (if exist) and then real values
function [outAttributes, attUpperRange, selectedAttr, attStat] = PrepareAttributes5(dataFilePath, dataFileName, expectedAttrCols, maxAttStat, inSelectedAttr, debug, debugPath)


outNoneValue = 0;
inNoneValue = -1;  

countryCol = 1;
countryCompress = 1;
countryOffset = 129; % min value is -128 => real value starting from 1
%countryUnknown = -999;

if nargin < 4
    fprintf('PrepareAttributes - Invalid parameters. expecting: dataFilePath, rawAtts, debug\n');
    return;
end
if nargin < 5
    maxAttStat = 0.50; % use this attribute only if it appears less than this percentage
end
if nargin < 6
    selectedAttr = ones(1,expectedAttrCols);
else
    selectedAttr = inSelectedAttr;
end
if nargin < 7
    debug = 0;
end
if nargin < 8
    debugPath = 'debug/';
end
    
outFullPath = strcat(dataFilePath, debugPath);
outFullName = strcat(outFullPath,dataFileName);

if isdir(outFullPath) == 0 && debug == 1 
    mkdir(outFullPath);
end

% load row data from file
% sigal - 12.6.13 - use mat binary file
%attributes = LoadAsciiAttributes(dataFilePath, dataFileName, numNodes, debug, debugPath);
fprintf('%s ---- %s', dataFilePath, dataFileName);
load(strcat(dataFilePath, dataFileName), 'attributes');
m = size(attributes,1); % num nodes/lines
n = size(attributes,2); % num attributes/cols
    
if n ~= expectedAttrCols 
    fprintf('PrepareAttributes - Invalid size: expecting (%d), got (%dx%d)\n',expectedAttrCols,m,n);
    return;
end

% first process all attributes, then filter by selected and max statistics
outAttributes = zeros(m,n); 
for col=1:n
    for line=1:m
        if (col == countryCol) 
            value =  attributes(line, col)+countryOffset;
            if (value < 0)
                outAttributes(line, col) = outNoneValue;
            else
                outAttributes(line, col) = value;
            end
        else  % games/groups (all other columns)
            value =  attributes(line,col);
            if value == inNoneValue
                outAttributes(line, col) = outNoneValue;
            else % no threshold, i.e. binary value
                outAttributes(line, col) = 1;
            end
        end
    end
end

% calculate COUNTRY statistics and filter according to maxAttStat
if selectedAttr(countryCol) == 1
    new_values = outAttributes(:, countryCol);
    maxCountry = max(new_values);
    for i=1:maxCountry
        indices = (new_values==i);
        count = sum(indices);
        if count/m > maxAttStat
           new_values(indices) = 0;
        end
    end
    outAttributes(:, countryCol)= new_values;
end

% remove empty country indexes and shift codes
if countryCompress && selectedAttr(countryCol) == 1
    new_values = outAttributes(:, countryCol);
    maxCountry = max(new_values);
    for i=1:maxCountry
        indices = find(new_values==i);
        if size(indices,1) == 0
            indices = find(new_values>i);
            if size(indices,1) == 0
                break;
            else
                new_values(indices) = new_values(indices) -1;
            end
        end
    end
    %maxCountry = max(new_values);
    outAttributes(:, countryCol)= new_values;
end

% calculate statistics and filter according to zero & maxAttStat
attStat = zeros(1,n);
for a = 1:n
    attStat(a) = nnz(outAttributes(:,a))/m;
    if attStat(a) == 0
        selectedAttr(a)=0;
    elseif selectedAttr(a)>0 && attStat(a) > maxAttStat && a>1 % don't filter country
        selectedAttr(a)=0;
    end
end
%filter according to updated selectedAttr
for a = 0:n-1 % run in reverse order
    if selectedAttr(n-a)==0
        outAttributes(:,n-a) = []; % remove this column
    end
end

attUpperRange = max(outAttributes);
%attLowRange = min(attributes);

if debug == 1
    outFullName = sprintf('%s.att2%d', outFullName, numThreshold);
    save(strcat(outFullName,'.mat'), 'outAttributes');
    SaveIntMatrixToFile(strcat(outFullName,'.txt'), outAttributes);
end