save in a folder

Hi,

I want to save in a folder mat files with a changing name.

    for i=1:length(ID)
        Filename=[num2cell(ID(i)) '.mat'];
        save('C:\Users\Documents\MATLAB\TechnicalFinal\Filename','Close')
    end

I am ending up with a file called Filename.mat instead of 1.mat,2.mat,and 3.mat where 1,2,3 are the ID number in the loop. Is there a way to fix that? Best

Answer 1

[Azzi Abdelmalek]

use

for k=1:5
  Filename=sprintf('%d.mat',k);
end

Also

save(['C:\Users\Documents\MATLAB\TechnicalFinal\' Filename],'close')

Because

filename='2.mat'
folder='C:\Users\filname'

Result

C:\Users\filname

and now

filename='2.mat'
folder=['C:\Users\'  filename]

Result

C:\Users\2.mat

Answer 2

[Image Analyst]

Follow the instructions in The FAQ. It covers changing mat filenames in a loop. It's also good to use fullfile() in addition to sprintf() to build the complete filename, as the second FAQ example shows.

folder = 'C:\Users\Documents\MATLAB\TechnicalFinal'; % Or wherever you want.
for k = 1 : length(ID)
    % Create the base file name from the number contained in the "ID" variable.
    baseFileName = sprintf('%3.3d.mat', ID(k)); % For example '037.mat'.
    % Prepend the folder to get the full file name.
    fullFileName = fullfile(folder, baseFileName);
    % Save the variable (badly) named "Close" to this mat file. 
    save(fullFileName, 'Close');
end

I use 3.3d so that we will have 3 digits for the base file name and they will sort properly when the names are retrieved from dir() or when looking at the files in File Explorer. This will handle up to 999 files. If you have more than that increase the 3 to 4 or 5 or whatever is needed.