how to put this conversion in for loop?

hi..below code is to convert .tim file to ascii file for one particular file.but i need to convert for 500 files(.tim). also i need to save the ascii file in SAME name as the .tim file name like below for all 500 files..i dono how to put this all in "for loop" to do conversion with same file name... or any suggestion for this problem...help me with this...

    bin=fopen('file_01.tim','r'); 
     ascii = fread(bin, [43,21000], 'float32'); 
     data_values=ascii';
      dlmwrite('file_01.xls', data_values, 'delimiter', '\t', ...
         'precision', '%.6f','newline','pc');

Answer 1

[Iain]

 a = dir('d:\mytimsarehere\*.tim');
 for i = 1:numel(a)
  filename_in = ['d:\mytimsarehere\' a(i).name];
  filename_out = [filename_in(1:end-3) 'txt'];
  fid = fopen(filename_in,'r');
  ascii = fread(bin, [43,21000], 'float32'); 
  data_values=ascii';
  dlmwrite(filename_out, data_values, 'delimiter', '\t', ...
         'precision', '%.6f','newline','pc');
  fclose(fid);
 end

[Jan]

The OP wants 'xls'. "1:end-3" removes the dot also. More flexible:

folder = 'd:\mytimsarehere\'; 
a = dir(fullfile(folder, *.tim'));
for i = 1:numel(a)
  filename_in  = fullfile(folder, a(i).name);
  [dummy, name] = fileparts(a(i).name);
  filename_out = fullfile(folder, [name, '.xls']);
  ...

Answer 2

[Chandra Shekhar]

Use uigetfile to read multiple file names in a loop.

for example...

for i=1:500

 [filename, pathname, filterindex] = uigetfile('*.tim', 'r');

end

Answer 3

[Jan]

See: http://www.mathworks.com/matlabcentral/answers/57446-faq-how-can-i-process-a-sequence-of-files