mixing string name and number,is my commmand correct??

Hi All

Since I just dont remember and dont know how to search for this question

would like to know

for naming the file as :

for i=1:100
    delete('filename'+num2str(i))
end

is it correct ?

Answer 1

[Image Analyst]

I'd recommend you follow the FAQ: http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F because your method is not very robust. I prefer sprintf(). If you're not going to use, or can't use, dir() to get a listing of what files are there, then at least you should use exist() so you don't throw an exception that aborts your loop when the file is not found. That is what people do when they write robust code.

for k = 1 : 100  % Use k, not i (the imaginary variable)
    baseFileName = sprintf('filename%d', k);
    % Prepend the folder where the files live.  
    % If it's the current folder, then you can use folder = pwd.
    fullFileName = fullfile(folder, baseFileName);
    if exist(fullFileName, 'file')
        % If the file exists, delete it.
        delete(fullFileName);
    end
end

but again, see the FAQ for better code examples than that.

[farzad]

Bravo !! perfect answer , great tips

[farzad]

just one thing , what does the %d imply in filename%d ?

[farzad]

and also , where do I put the .extension of the filename in the base or full file name , I mean , how should it look like ?

[Adam]

If you put the extension on the baseFileName it will the get included correctly in the fullFileName.

%d is a placeholder for an integer which gets replaced by the value of k each time round the loop (look at formatSpec in the help for sprintf for other options here if you are interested in general, but %d is the correct one for this case)

Answer 2

[Claude Porlier]

Try using this !

for i=1:100
    delete(strcat('filename',num2str(i)))
end

Cheers !

[farzad]

Thanks a lot , I still have a question that I put in the end , if you do a favor check , thanks a lot

Answer 3

[farzad]

I got a bit confused , Since I have two file types : one is like :

file1.txt.i

the other

file2i.rec

in both , the letter "i" is the changing number , so I need to know in all of the methods you have proposed , hwo should I call them, I am getting some errors

thank you very much in advance