How to combine hundreds of CSV files in Matlab?

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Maksim Sorin
Maksim Sorin 2022년 3월 21일
댓글: SETIAWATI 2025년 9월 24일 0:32
Hi all,
I have LOTS of data in CSV files and I'd like to create one massive master CSV file. How can I combine all of the CSV files into one? Each CSV file has a header with time, type of data, etc. They all have the same number of columns but differet numbers of rows.

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Voss
Voss 2022년 3월 21일
Here's an example of how to do it (with 2 files):
input_path = '.'; % location of .csv files
output_file = 'result.csv'; % name of file containing combined data
% read each .csv file into a table stored in a cell array of tables
% called 'all_data':
file_info = dir(fullfile(input_path,'*.csv'));
full_file_names = fullfile(input_path,{file_info.name});
n_files = numel(file_info);
all_data = cell(1,n_files);
for ii = 1:n_files
all_data{ii} = readtable(full_file_names{ii});
end
% check the tables:
all_data{:}
ans = 4×2 table
time type ____ _____ 0 {'A'} 1 {'B'} 2 {'C'} 3 {'B'}
ans = 3×2 table
time type ____ _____ 0 {'B'} 1 {'A'} 2 {'C'}
% concatenate all the tables into one big table, and write it to
% output_file:
writetable(cat(1,all_data{:}),output_file);
% check that the resulting output file exists:
dir('*.csv')
data_1.csv data_2.csv result.csv
% check the contents of the resulting output file:
readtable(output_file)
ans = 7×2 table
time type ____ _____ 0 {'A'} 1 {'B'} 2 {'C'} 3 {'B'} 0 {'B'} 1 {'A'} 2 {'C'}
  댓글 수: 1
SETIAWATI
SETIAWATI 2025년 9월 24일 0:32
I try to use your example for my exercise but once I run the code. The matlab can not read the "writetable(cat(1,all_data{:}),output_file);" part. Can you tell me why? Because I already try everything but I have not figure it out.

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