Writting multiple files with fopen 'w'

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Cristian Martin 2022-5-20

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https://ww2.mathworks.cn/matlabcentral/answers/1723785-writting-multiple-files-with-fopen-w

评论： Voss 2022-5-20

采纳的回答： Voss

fileID = fopen('text\test.txt','w');

fprintf(fileID,'Comments:');

fclose(fileID);

Hi,

What can I do to not overwrite the previous file

There is a way for every time I run the script to make another file and not rewritte the old one, like test1.txt, test2.txt and so on?

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Stephen23 2022-5-20

https://blogs.mathworks.com/pick/2020/01/10/determining-next-available-file-name/

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采纳的回答

Voss 2022-5-20

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Here's a function (get_unused_file_name) you can use for this purpose. It takes a file name and check if that file already exists. If it does, the function appends '1' to the name and checks if that exists. If it does, it tries '2', and so on until it gets one that doesn't already exist, and returns that unused file name.

Here's a demonstration of it:

fn_orig = fullfile(pwd(),'text','test.txt') % file name to try
fn_orig = '/users/mss.system.Cr4l4C/text/test.txt'
mkdir('text')
% calling the function 4 times
for ii = 1:4
    
    fn = get_unused_file_name(fn_orig)
    
    % create the file so that next time around 
    % this file name is already taken:
    fid = fopen(fn,'w');
    fclose(fid);
    
end
fn = '/users/mss.system.Cr4l4C/text/test.txt'
fn = '/users/mss.system.Cr4l4C/text/test1.txt'
fn = '/users/mss.system.Cr4l4C/text/test2.txt'
fn = '/users/mss.system.Cr4l4C/text/test3.txt'
function file_name = get_unused_file_name(file_name)
[pn,fn,ext] = fileparts(file_name);
ii = 0;
while isfile(file_name)
    ii = ii+1;
    file_name = fullfile(pn,sprintf('%s%d%s',fn,ii,ext));
end
end