Generate a cell array with index values from two separate vectors

Question

Ronald 2020-5-24

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/532128-generate-a-cell-array-with-index-values-from-two-separate-vectors

评论： Ameer Hamza 2020-5-25

I have two cell arrays

x = {99983, 885735, 8993, 63742, 37443, 38437, 67638}

y = {99983, 885735, 99983, 885735, 8993, 63742, 37443, 38437, 67638, 8993, 99983, 885735, 8993, 63742, 99983, 885735, 8993, 63742, 37443, 38437, 67638,37443, 38437, 67638, 63742, 37443, 38437, 67638}

I would like to obtain a new cell array, z, such that:

z = {[1 3 11], [2 4 12 16], [5 11 13 17], [6 14 18 25], [7 19 22 26], [8 19 22 26], [9 21 24 28]}

In other words, z contains the index locations of the x elements in y

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Answer 1

Ameer Hamza 2020-5-24

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/532128-generate-a-cell-array-with-index-values-from-two-separate-vectors#answer_437633

在 MATLAB Online 中打开

Try this

x = {99983, 885735, 8993, 63742, 37443, 38437, 67638};
y = {99983, 885735, 99983, 885735, 8993, 63742, 37443, 38437, 67638, 8993, 99983, 885735, 8993, 63742, 99983, 885735, 8993, 63742, 37443, 38437, 67638,37443, 38437, 67638, 63742, 37443, 38437, 67638};
[~, idx] = ismember([y{:}], [x{:}]);
z = splitapply(@(x) {x}, 1:numel(y), idx);