MATLAB: How to find duplicate values in a structure

Question

I would like to find all the fields and values from a structure having duplicate values.

Answer 1

Find below the function that takes structure "s" as input and gives you a cell array with duplicates. Please note that output of the below function would be a cell array. If you need a structure instead of cell array as output, please return the "newStruct" value in the below function.

    function finalDuplicatesCellArray = selectDuplicates(s)
        keys = fieldnames(s);
        values = struct2array(s);
        uniqueValues = unique(values);
        valueCounts = histcounts(values, length(unique(values)));
        idx = valueCounts > 1;
        duplicatedValues = uniqueValues(idx);
        duplicateValuesIndices = ismember(values,duplicatedValues, 'legacy');
        duplicateKeys = keys(duplicateValuesIndices);
        duplicateValues = values(duplicateValuesIndices);
        newStruct = struct;
        for ii = 1:length(duplicateKeys)
            newStruct.(char(duplicateKeys(ii))) = duplicateValues(ii);        
        end
         %Convert the newStruct to cell array
         valuesFinal = num2cell(duplicateValues');
         finalDuplicatesCellArray = [duplicateKeys,valuesFinal];   
    end

Input example: S.A = 1; S.C = 1; S.E = 1; S.F = 1;

Output: 4×2 cell array

    'A'    [1]
    'C'    [1]
    'E'    [1]
    'F'    [1]