read multiple csv files from different subfolders

9 次查看(过去 30 天)
I have a folder, "Raw data", which contains subfolders for subjects 005 - 016. In each subfolder, I want to choose a subsubfolder, "A". In "A" folder, there are 23 .csv files. How can I read them as individual file (without merging them) at once, maybe using a loop function of other methods?

回答(3 个)

prasanth s
prasanth s 2019-10-17
编辑:prasanth s 2022-12-14
Use 'dir' function to get the directory and file list of any folder. e.g
D=dir('Raw data');
output 'D' is an structure array contains all foldernames.
use following code to get all csv filenames
A=dir('myfolder\*.csv');
get the filenames from 'A' and
use 'csvread' function to read each csv files

Image Analyst
Image Analyst 2022-12-14
Try this:
% Specify top level folder and file pattern.
topLevelFolder = pwd; % Or whatever you want.
filePattern = fullfile(topLevelFolder, '*.csv')
% Get a list of all files in that folder and within its subfolders.
ds = fileDatastore(filePattern, 'ReadFcn', @readmatrix)
allFileNames = ds.Files

Four Eyes
Four Eyes 2023-10-13
编辑:Four Eyes 2023-10-13
This might be coming in too late. But I recently ran accross a similar problem and here is what that worked for me. Hopefully it is useful to someone!
Suppose you have Fodler 1 stored somewhere like C:\Users\username...\Folder1\....
And You have multiple subfolders like this:
C:\Users\username...\Folder1\Subfolder1\Random_name1.csv; C:\Users\username...\Folder1\Subfolder1\Random_name2.csv;
C:\Users\username...\Folder1\Subfolder2\Random_name3.csv; C:\Users\username...\Folder1\Subfolder2\Random_name4.csv;
and so on
%To read all the file names, do this:
location = C:\Users\username...\Folder1\**\;
files= dir([location '*.csv'])
%To read the data and store in a matrx, do this:
for ii = 1:length(files)
data(:,:,ii) = readmatrix([files(ii).folder '\' files(ii).name]);
end
  1 个评论
Image Analyst
Image Analyst 2023-10-13
but for robustness you should use fullfile to construct the file pattern and filename.
% To read all the file names, do this:
location = "C:\Users\username...\Folder1\**\";
filePattern = fullfile(location, "*.csv")
files = dir(filePattern)
% To read the data and store in a 3-D array, do this:
% (NOTE: all data must be the same size 2-D matrix).
for ii = 1 : length(files)
fullFileName = fullfile(files(ii).folder, files(ii).name);
fprintf('Processing %d of %d : "%s".\n' ii, numel(files), fullFileName)
data(:,:,ii) = readmatrix(fullFileName);
end

请先登录,再进行评论。

类别

Help CenterFile Exchange 中查找有关 File Operations 的更多信息

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by