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

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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.
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Samyukta Ramnath
Samyukta Ramnath 2013-6-14
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

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Walter Roberson
Walter Roberson 2013-6-14

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