How to use the break command in nested loops?

Question

Yro 2022-2-17

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1651840-how-to-use-the-break-command-in-nested-loops

评论： Image Analyst 2022-2-17

Hi, I have a problem using the break command in the following code. When I use the break I exit the loop j, but I want to restart the loop i after the condition. Any idea how can I do in this case? Thanks inm advance.

for i = 1:length(initial_solution.position) - 1 
    itabu = i;
    for j = i + 1:length(initial_solution.position)
        jtabu = j;
        t = CHECK_MOVE(itabu, jtabu, TL);
        
        if (t == 1) % 0 or 1 / True or False / Tabu or not Tabu
		
            break
			
        end
	    neighbor.position = SWAP(initial_solution.position, itabu, jtabu);
	    % Evaluate Objective Function
	    neighbor = EVALUATE_OF(neighbor);
	    % Update best neighbor
        if neighbor.OF >= best_neighbor.OF
            best_neighbor = neighbor;
        end
    end
end

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AndresVar 2022-2-17

i think you need another outter while loop to repat the whole thing. And a flag to tell it to stop when all the i and js were done.

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Answer 1

David Hill 2022-2-17

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1651840-how-to-use-the-break-command-in-nested-loops#answer_898150

编辑：David Hill 2022-2-17

在 MATLAB Online 中打开

while 1
flag=0;
 for i = 1:length(initial_solution.position) - 1 
    itabu = i;
    for j = i + 1:length(initial_solution.position)
        jtabu = j;
        t = CHECK_MOVE(itabu, jtabu, TL);
        
        if (t == 1) % 0 or 1 / True or False / Tabu or not Tabu
		    flag=1;
            break
			
        end
	    neighbor.position = SWAP(initial_solution.position, itabu, jtabu);
	    % Evaluate Objective Function
	    neighbor = EVALUATE_OF(neighbor);
	    % Update best neighbor
        if neighbor.OF >= best_neighbor.OF
            best_neighbor = neighbor;
        end
    end
    if flag
       break;
    end
 end
 if ~flag
     break;
 end
end