Renaming files in directory that meet array criterion

Let's say I have some files in a directory my_directory:

file_23.txt
file_35.txt
file_37.txt

I'm reading the files through

my_files = dir(fullfile(my_directory,'file_*.txt'))

and let's say I have an array my_array, which contains some values:

23
37

I want to rename the files with numbers matching the numbers in the array, by doing something along the lines of

for i = 1:length(my_array)
    j=my_array(i)
    
    % rename each appropriate file in my_directory here to file_j_new.txt
end

So in the end I want my_directory to contain

file_23_new.txt
file_35.txt
file_37_new.txt

How do I do this, keeping in mind that the files are in a different directory?

Answer 1

[KALYAN ACHARJYA]

Try?

text_files=dir('C:\complete_path_text_files\*.txt');
outDirectory='C:\complete_path_to save_txt_files\';
array_data=[.........];
% Please note that array length must be same or greater the length of text_files
for i=1:length(text_files)
textfile=strcat('C:\complete_path_text_files\',text_files(i).name);
writetable(textfile,strcat(outDirectory,text_files(array_data(i)).name));
end

Or in the same directory to create new file

textfiles=dir('*.txt');  
array_data=[........];
for ii=1:length(textfiles)
   filename=textfiles(ii).name;
   file1=importdata(filename);
   writetable(file1,strcat(filename_(array_data(i)).name));
   %............................^ May be minor change required here
end

Please note, I did not try the code, I wrote here based on my images call and write concept.

Hope it helps!

[g]

Thank you, but array length cannot be greater than the length of text_files.. as in my example.

[KALYAN ACHARJYA]

its ok, then must be same.

[g]

In my example, array length is smaller than the length of text_files

[KALYAN ACHARJYA]

Suppose you have planning to rename the three text files

text1
text2 
text3

And you want to add some number at last of the file name as per following array

array=[23 47] % Having length 2

Then, files name becomes

text1_23
text2_47

and

text3_???  %Now what next

In the repeat or?

[g]

I want to rename the files

file_23.txt
file_35.txt
file_37.txt

with the array

23
37

to

file_23_new.txt
file_35.txt
file_37_new.txt