How to open multiple files

I think I posted this question in the wrong place earlier. I searched the Answers but didn't see anything that helped me.

I have code that opens a file, modifies the file, then saves the file with a new extension. I would like to be able to select multiple files in a directory, modify each one and then save each one with the new extension.

Here is my code to open a single file:

DefaultFile='';
[oldFileName,PathName] = uigetfile('*.txt','Select File to Modify',DefaultFile);
fid=fopen(fullfile(PathName,oldFileName));

Here is my code to save the file with a new extension:

[folder, oldBaseName, oldExt] = fileparts(oldFileName);
newBaseName = sprintf('%s.rsp',oldBaseName);
newFullFileName = fullfile(folder, newBaseName);
fileID = fopen(newFullFileName,'w');
fprintf(fileID,'%15s\r\n','# MHz Y RI R 50');
fprintf(fileID,'%6.2f %12.8f %12.8f\r\n',dataExport);
fclose(fileID);

So, how do I create a loop to be able to: 1. Select multiple files (number of files will vary each time I run this). 2. Modify my file (I have the code to do that). 3. Save the modified file with the new extension (see code above). 4. Repeat steps 2 and 3 until all files have been modified.

Thanks.

Answer 1

[Walter Roberson]

Use uigetfile() with 'MultiSelect', 'on'. Then a cell array of strings is returned for the file name. You can loop through that.

[AsYouWish]

I am a a newbie and don't know where to find "Multiselect". Thanks.

[AsYouWish]

Think I found it.

[oldFileName,PathName] = uigetfile('*.dat','Select the dat-files', 'MultiSelect','on');

[AsYouWish]

So I ran the code and I can open the cell array and see that all files have been read in but I am not sure how to cycle through each file with the loop. Any tips?

Thanks.

[Walter Roberson]

[oldFileNames,PathName] = uigetfile('*.dat','Select the dat-files', 'MultiSelect','on');

for K = 1 : length(oldFileNames)
  oldFileName = oldFileNames{K};
  [....]
end

[AsYouWish]

Thanks. That works great!

Answer 2

[Image Analyst]

Or, you might try this nice function:

http://www.mathworks.com/matlabcentral/fileexchange/10867-uipickfiles-uigetfile-on-steroids

[AsYouWish]

I downloaded the dll and will give it a try this morning. Thanks.