Based on my understanding of the question:
- You have files (referred to as ‘subjects’ by you) named as ‘sub1’, ‘sub2’ , …, ‘sub44’.
- Each file has multiple columns (you have referred to them as ‘features’).
- You want to loop through the 44 files and extract certain features from each file.
You can refer to the example code below where I have taken the case if you want to extract features corresponding to say, column 2 and column 4:
% Preallocate cell arrays to store the extracted features
feature2 = cell(44, 1);
feature4 = cell(44, 1);
% Loop through each file
for i = 1:44
% Construct the filename
filename = sprintf('sub%d', i);
% Load the data from the file
data = load(filename);
% Extract feature2 and feature4
feature2{i} = data(:, 2); % Extract the second column
feature4{i} = data(:, 4); % Extract the fourth column
end
After the loop, the cell arrays feature2 and feature4 will contain the extracted features from all the files.
