For Loop only showing data for last file within Array

I am trying to create a script that will load multiple xlsx files into one variable. When I run the code, I am able to see the correct number of files being processed however the variable I created to store files only shows the last files processed in the loop. *** I'm a beginner*** please let me know what I need to do so that the variable I created to store the files ( data_in) will no longer read as a 1x73 double rather a 3x73 double.

clear all; clc

[file_list, path_n] = uigetfile('.xlsx', 'Grab the files you want to process', 'MultiSelect', 'on');

if iscell(file_list) == 0
    file_list = {file_list};
end
    
for i = 1:length (file_list)
    filename = file_list{i};
    data_in = xlsread([path_n filename]);
    
end

Answer 1

[Voss]

Make data_in a cell array, and store the contents of each file in a different cell of data_in:

clear all; clc

[file_list, path_n] = uigetfile('.xlsx', 'Grab the files you want to process', 'MultiSelect', 'on');

if ~iscell(file_list)
    file_list = {file_list};
end

n_files = numel(file_list);

data_in = cell(n_files,1)

for ii = 1:n_files
    
    filename = file_list{ii};
    
    data_in{ii} = xlsread([path_n filename]);
    
end

Then vertically concatenate the contents of all the cells of data_in. This will only work if all the cells' contents have the same number of columns.

data_in = vertcat(data_in{:});

% if each file contains a single row of data with 73 columns,
% then data_in is now a n_files-by-73 matrix

[Donovyn Murray]

That seems to have worked. All my data will populate in 73 columns so as I continue to add more files this should work out. Thank you.

[Voss]

You're welcome!