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function n = normalize(data)
assert(size(data, 1) > 1)
_min = repmat(min(data), size(data, 1), 1);
_max = repmat(max(data), size(data, 1), 1);
equals = (_min == _max);
if any(any(equals))
_min = _min .* ~equals;
_max = _max .* ~equals + ones(size(_max)) .* equals;
end
n = (data - _min) ./ (_max - _min);
end
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