Select X, Y coordinates randomly but only do each pair 5 times

Question

HumbleCoder 2023-3-9

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1925920-select-x-y-coordinates-randomly-but-only-do-each-pair-5-times

回答： Voss 2023-3-9

I have a code that selects an X, Y coordinate from a list of numbers, maintains it for 5 trials, and then moves to the next in sequential order (e.g. 3, 15 to -3, 15). I now want the code to randomly select a coordinate pair each trial but only test each location 5 times at the end of testing. Any suggestion for how I can do this?

X_vector        = [3; -3; -9; -15; -21; -15; -9; -3; 3; 3; -3; -9; -15; -21; -21; -15; -9; -3; 3; 3; -3; -9; -15; -21; -15; -9; -3; 3;];
Y_vector        = [15; 15; 15; 15; 9; 9; 9; 9; 9; 3; 3; 3; 3; 3; -3; -3; -3; -3; -3; -9; -9; -9; -9; -9; -15; -15; -15; -15;];
for k = 1 : numel(X_vector)
    for n = 1 : 5
        x = X_vector(k);
        y = Y_vector(k);
        % Now use x and y in some way.
    end
end

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Answer 1

Voss 2023-3-9

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https://ww2.mathworks.cn/matlabcentral/answers/1925920-select-x-y-coordinates-randomly-but-only-do-each-pair-5-times#answer_1189570

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X_vector        = [3; -3; -9; -15; -21; -15; -9; -3; 3; 3; -3; -9; -15; -21; -21; -15; -9; -3; 3; 3; -3; -9; -15; -21; -15; -9; -3; 3;];
Y_vector        = [15; 15; 15; 15; 9; 9; 9; 9; 9; 3; 3; 3; 3; 3; -3; -3; -3; -3; -3; -9; -9; -9; -9; -9; -15; -15; -15; -15;];
n_trials = 5;
idx = repmat(1:numel(X_vector),1,n_trials);
idx = idx(randperm(numel(idx)))
idx = 1×140
    20    23    12    19     2    18    16    22     3     1    14     2     1    16     8    18    22    22    17     7    11    20    26     4    21    19     4     6    13    12
for k = 1 : numel(idx)
    x = X_vector(idx(k));
    y = Y_vector(idx(k));
    % Now use x and y in some way.
end