Sync cell arrays using unique

Question

Joel Schelander 2021-4-20

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https://ww2.mathworks.cn/matlabcentral/answers/807747-sync-cell-arrays-using-unique

回答： Chetan 2024-2-28

I have two cells GUD and GUDID, GUD is containing a 1x1000 double and GUDID contains a cell for every element in GUD.

I am calculating on GUD here. GUDID contains one ID number for every element in GUD

GUD={[2.56 3.23 1.22....]}
GUDID={173 178 180....}
for lol = 1:numel(GUD)
    GUD{lol}=unique(GUD{1,lol});
    %GUDID{lol}=...?
end

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Rik 2021-4-20

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It is not clear to me what you question is or what you want to do.

One tiny speedup: as long as you avoid some classes (strings, tables, timetables, and more), you can use the legacy syntax:

idx = ~cellfun('isempty',GUD{lol});

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Answer 1

Chetan 2024-2-28

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Hi @Joel Schelander

I understand you need to synchronize your `GUDID` cell array with the unique values obtained from the `GUD` cell array.

To achieve this, you can utilize the index output from the `unique` function to subset the corresponding IDs.

Here's the modified loop with some mock data:

% Mock data
GUD = {[2.56, 3.23, 1.22, 2.56, 3.23], [1.11, 1.22, 1.11]};
GUDID = {[173, 178, 180, 173, 178], [190, 180, 190]};
% Process to get unique values and corresponding IDs
for lol = 1:numel(GUD)
    [GUD{lol}, ia] = unique(GUD{1,lol}, 'stable'); % 'stable' keeps original order
    GUDID{lol} = GUDID{lol}(ia); % Subset the IDs based on unique value indices
end
GUD
GUD = 1×2 cell array
    {[2.5600 3.2300 1.2200]}    {[1.1100 1.2200]}
GUDID
GUDID = 1×2 cell array
    {[173 178 180]}    {[190 180]}