How do I change the name of a file inputted to a function in MATLAB?

I want to input a text file to a function, and after running the function, want to change the filename to a specific thing, depending on the results of the function. For example, if the function classifies the folder as belonging to History, I want to rename the text document to History1, if another test file gets classified as belonging to topic history, I want it to be renamed as History2, and so on, and placed in a specific folder.

[Jan]

Ok. What have you tried and which problems have occurred?

[Samyukta Ramnath]

I did use the copyfile and thought that I could use a persistent variable, so that each time the function runs, if the file was classified as History, then the persistent variable var_hist would be incremented. But I don't know how to save the name as History1, History2 etc. by incrementing the number every time it is classified as History.

if true
  if Prob_Hist(1) == max(Prob)
      disp('History');
      var_hist = var_hist + 1;
      copyfile('InputFile.txt','new_name.txt'); 
  end
end

Answer 1

[Walter Roberson]

http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F