Loading .csv files based on file name in Matlab - matlab

Question

I have a large number of csv files which are named sequentially based on date in the same folder.
example name (d_log_yyyymmddhhmmss). All files have the same number of columns and headers and ultimately I am concatanating.
I am loading them using the following which seems to be fast and efficient:. However, this works for limited files and as I have large amounts I want to split them in cells based on the date they include in their name. For example within a month it would create 30 cell arrays with individual files and 30 concatanated files. Any help appreciated.
d = uigetdir();
filePattern = fullfile (d, '*.csv');
file = dir (filePattern);
Data =cell (1, numel(file));
for k=1 : numel(file)
filename = file(k).name;
fullfilename = fullfile (d, filename);
Tables {k} = readtable (fullfilename);
fprintf ('read file %s\n', fullfilename);
end
bigdata = vertcat (Data{:});
EDIT
d = uigetdir();
filePattern = fullfile (d, '*.csv');
files = dir (filePattern);
unique_months_list = {};
for i = 1:numel(files)
file_month = files(i).name(07:12); % yyyymm part
basefilename = files(i).name;
fullfilename = fullfile (d, basefilename);
if ismember(file_month, unique_months_list);
TablesSep {i} = readtable (fullfilename);
fprintf ('read file %s\n', fullfilename);
else unique_months_list {end+1} =file_month;
fprintf ('read file %s\n', fullfilename);
TablesOct {i} = readtable (fullfilename);
% elseif
% unique_months_list {end+2} =file_month;
% disp('new'); % do your thing if another month
%TablesNov {i} = readtable (fullfilename);
end
end

Answer 1

Edited according to your comment:
files = dir('d_log_*');
unique_months_list = {};
for i = 1:numel(files)
file_month = files(i).name(7:12); % yyyymm part
if ismember(file_month, unique_months_list)
disp('same'); % do your thing if same month
else
unique_months_list {end+1} = file_month;
disp('new'); % do your thing if another month
end
end