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function C = mysetdiff(A,B)
% MYSETDIFF Set difference of two sets of positive integers (much faster than built-in setdiff)
% C = mysetdiff(A,B)
% C = A \ B = { things in A that are not in B }
%
% Original by Kevin Murphy, modified by Leon Peshkin
if isempty(A)
C = [];
return;
elseif isempty(B)
C = A;
return;
else % both non-empty
bits = zeros(1, max(max(A), max(B)));
bits(A) = 1;
bits(B) = 0;
C = A(logical(bits(A)));
end
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