I am trying to find the shortest path possible in an array of numbers using MATLAB and I keep getting "Index in position 1 exceeds array bounds (must not exceed 5).". I tried changing 5 to any other number and it didn't work. Can anyone please help?

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Abhinav Sharma 2021-2-17

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https://ww2.mathworks.cn/matlabcentral/answers/748397-i-am-trying-to-find-the-shortest-path-possible-in-an-array-of-numbers-using-matlab-and-i-keep-gettin

评论： Abhinav Sharma 2021-2-17

a = [1 4; 2 6; 3 8; 4 10; 5 12];
n = 1;
image(a);
disp(a);
iteration = 1;
iter = 1;
distanceShortest = 100;
chosenMatrix = [];
while iter < 50
    itr = 1;
    distance = 0;
    randomA = a(randperm(size(a, 1)), :);
    while itr < 5
        distance = distance + norm([randomA(n,1) randomA(n,2)] - [randomA(n+1,1) randomA(n+1,2)]);
        itr = itr + 1;
        n = n + 1;
    end
    if distance < distanceShortest
       distanceShortest = distance;
       chosenMatrix = randomA;
    end
    iter = iter + 1;
end
disp(distanceShortest);
disp(chosenMatrix);

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Answer 1

dpb 2021-2-17

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Easy to forget/overlook...

n=1:
...
while itr < 5
  distance = distance + norm([randomA(n,1) randomA(n,2)] - [randomA(n+1,1) randomA(n+1,2)]);
  n=n+1;
  ...

You hold the loop iteration count to <5 (ought to use a variable here so can change size of A more easily, but that's a side issue) and reset itr inside the outer loop over iter, but you don't reset n Hence, it will be whatever it was at the end of the first inner loop and keep incrementing from there.