What Mistake I am making in the code

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Manav Divekar
Manav Divekar 2021-11-4
回答： Steven Lord 2021-11-4
I want to randomly pick two numbers from [39 25 91 71] swap it. and use while loop so that it swaps continuely until the vector is sorted. and display the sorted vector.
function out = sortbyrandomswaps(n)
x = 0;
y = 0;
while ~ all(diff(n)>=0)
x = n(randi(numel(n)));
y = n(randi(numel(n)));
x = a;
y = x;
a = y;
end
out = all(diff(n)>=0);

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采纳的回答

Yongjian Feng
Yongjian Feng 2021-11-4
编辑：Yongjian Feng 2021-11-4
Maybe this:
sortbyrandomswaps([5 4 3 2 1]);
function out = sortbyrandomswaps(n)
while ~ all(diff(n)>=0)
idx1 = randi(numel(n));
idx2 = randi(numel(n));
a = n(idx2);
n(idx2) = n(idx1);
n(idx1) = a;
disp(n); % for debug only. Remove it if everything works.
end
out = all(diff(n)>=0);
end

更多回答（1 个）

Steven Lord
Steven Lord 2021-11-4
Ran in:
FYI you can perform a swapping operation in one step without needing an explicit temporary:
x = (1:10).^2
x = 1×10
1 4 9 16 25 36 49 64 81 100
toSwap = [4 7]
toSwap = 1×2
4 7
x(toSwap) = x(flip(toSwap)) % key step
x = 1×10
1 4 9 49 25 36 16 64 81 100
You could generalize this a bit if you wanted to swap a series of elements.
toSwap2 = [2 5 3 8 1];
x(toSwap2) = x(circshift(toSwap2, 1))
x = 1×10
64 1 25 49 4 36 16 9 81 100
The second element of x goes to position 5, the fifth to position 3, the third to position 8, the eighth to position 1, and the first to position 2.

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