Plotting repeating values in excel files vs the files that they overlap in

I am trying to plot the number of times that values repeat between excel files. This code will be dealing with 200+ excel files per run that are formatted the same way.

For example, between file names "output3" and "output4", I want to see how many times a value repeats in excel columns 2 through 4. If there would be 5 values that overlap between these two excel files then on the plot, there would be a bar with a value of 5 and a label saying "between output3 and output4". I have attached my code attempt below with comments as to what I am trying to do in each section:

%% beginning of code imports excel files and the column values as variables

%wanting to find where the values overlap in columns 2 - 4

L = length(fieldnames(data));

data.idx2 = cell(L-1);

data.idx3 = data.idx2;

data.idx4 = data.idx2;

for j = 2:L

for i = 1:L-1

firstoutput = data.(sprintf("variables_%d", i));

secondoutput = data.(sprintf("variables_%d",j));

data.idx2{i} = ismember(firstoutput(:,2),secondoutput(:,2));

data.idx3{i} = ismember(firstoutput(:,3),secondoutput(:,3));

data.idx4{i} = ismember(firstoutput(:,4),secondoutput(:,4));

end

end

%wanting to obtain only the number "1" (i.e. true) to count the number of times that the values overlap

isTrue2 = cellfun(@(x)isequal(x,1),data.idx2);

isTrue3 = cellfun(@(x)isequal(x,1),data.idx3);

isTrue4 = cellfun(@(x)isequal(x,1),data.idx4);

%wanting to create a variable with all of the output file names

names = [];

for n = 1:length(cycle)

x = sprintf("output%d",n);

names = [names;x];

end

%wanting to plot the # of overlapping/ repeating values vs which files they appear in

bar(length(idx2_true),names)

bar(length(idx3_true),names)

bar(length(idx4_true),names)