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function C = myunion(A,B)
% MYUNION Union of two sets of positive integers (much faster than built-in union)
% C = myunion(A,B)
if isempty(A)
ma = 0;
else
ma = max(A);
end
if isempty(B)
mb = 0;
else
mb = max(B);
end
if ma==0 && mb==0
C = [];
elseif ma==0 && mb>0
C = B;
elseif ma>0 && mb==0
C = A;
else
%bits = sparse(1, max(ma,mb));
bits = zeros(1, max(ma,mb));
bits(A) = 1;
bits(B) = 1;
C = find(bits);
end
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