Ria - you really should post code that actually works. Your return value from this function is named a but nowhere in your function body do you actually initialize a. Should this be word instead? And if word is in fact the string text that you wish to write to your edit text box, then that is easy to do.
Suppose your function signature is
function [word] = identify(f)
and that this is saved to a file named identify.m. Now suppose you call this function from your GUI (let us say in a push button callback) as
function pushbutton1_Callback(hObject, eventdata, handles)
f = ...
word = identify(f);
set(handles.edit1, 'String', word);
Is that similar to the code that you are using?
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