Looping for cell arrays

I have a 3x11 cell array called down_files where each entry in the array is a filename and each of the rows corresponds to a different value for an angle. For example, row 1 corresponds to angle 1, row 2 to angle 2 and so on. The code below worked when the cell array was 1x11, but now that I have added two more rows to it I need to work for 3x11.

lengths_arr contains values read from each file. So lengths_arr should end up being a 3x11 matrix with each row corresponding to the correct angles again (row 1 for angle 2, row 2 for angle 2.......)

for i = 1:length(down_files)
    file_data = fileread(down_files{i}) 
    
    f = regexp(file_data, 'length(\d+)?)', 'tokens') % ignore. this is just getting the length values from the files
    if ~isempty(f)
        L = str2double(f{1})
        lengths_arr(end + 1) = L
    end
end

many thanks

[Stephen23]

Note that by using a look-around you can avoid one layer of the output's nested cell arrays:

f = regexp(file_data, '(?<=length)\d+)', 'match')

https://www.mathworks.com/help/matlab/matlab_prog/regular-expressions.html#brchk1t

Answer 1

[chicken vector]

Add a second loop for the rows:

for row = 1 : size(down_files,1)
    for col = 1 : size(down_files,2)
        fileread(down_files{row,col});
    end
end

[Davindra Usov]

Thank you. This gives me a 1x11 instead of a 3x11 for lengths_arr

[Adam Danz]

lengths_arr(row, col) =  L