optimize syntax with fprintf

[aernesto]

This line (and any other similar one) could be improved as per MATLAB's suggestion:

Explanation
The syntax disp(sprintf('...')) calls two functions and requires memory allocation. 
However, the syntax fprintf('...\n') requires no memory and allows the code to execute 
faster.
 
Suggested Action 
Replace disp(sprintf('...')) with fprintf('...\n'). You must include the new line 
character ('\n') to maintain behavior.