How to allow a single overlap during chain growth?

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Soma 2019-11-3

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https://ww2.mathworks.cn/matlabcentral/answers/488926-how-to-allow-a-single-overlap-during-chain-growth

编辑： Soma 2019-11-3

I have this code which doesn't allow any overlaps between chain segments. How can I modify it to allow a single overlap only.

                Trajectory  = [x+1 y;x-1 y;x y+1;x y-1];
                check=reshape(old_steps(:,i),2,m/2)';
                position=setdiff(Trajectory,check,'rows');

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Guillaume 2019-11-3

Can there be any duplicate row in Trajectory?

Soma 2019-11-3

No, Trajectory should be always unique. The duplication should be in check only.

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采纳的回答

Guillaume 2019-11-3

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https://ww2.mathworks.cn/matlabcentral/answers/488926-how-to-allow-a-single-overlap-during-chain-growth#answer_399550

编辑：Guillaume 2019-11-3

在 MATLAB Online 中打开

%this code only works if rows of Trajectory are unique
[intraj, where] = ismember(check, Trajectory, 'rows');  %find which row of check are in Trajectory and which row they match
trajcount = accumarray(where(intraj), 1, [size(Trajectory, 1), 1]);  %and compute the histogram of the rows found in Trajectory
position = Trajectory(trajcount == 1, :);  %to get the rows that are only once in check
%or
position = Trajectory(trajcount <= 1, :);  %to get the rows that are not in check or just once