How can I filter multiple files ?

I have made a filter as following

[b,a] = butter(9,.02,’low’); x=textread(‘noisy.out’); y=filter(b,a,x); save filtered.out y -ASCII

I have 1000 files and I would like to filter all my files using the above filter. Is there any way that I can do this efficiently? my files are named like 1.out 2.out , … 1000.out

any suggestion would be appreciated.

my *.out files just include one column with numbers

this is one example -4.034E+02 -4.007E+02 -3.987E+02 -3.978E+02

All numbers in one column and each file contains 13000 numbers

ANSWER

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Parse the folder for existing 1–1000.out files and import them one-by-one apply filter and save:

% Retrieve all the files in a directory
names = dir('C:\Users\Oleg\Desktop\Nuova cartella');
names = {names(~[names.isdir]).name};
% Select only the files #.out
idx   = ~cellfun('isempty',regexp(names,'\d+\.out'));
names = names(idx);
% Filter
[b,a] = butter(9,.02,'low'); 
for n = names
  % Open file for reading

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