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Section: String Functions
The upper function converts a string to upper case with the syntax 
y = upper(x)
 where x is a string, in which case all of the lower case characters in x (defined as the range 'a'-'z') are converted to upper case. Alternately, you can call upper with a cell array of strings 
y = upper(c)
in which case each string in the cell array is converted to upper case.
A simple example:
--> upper('this Is Strange CAPitalizaTion')
ans = 
THIS IS STRANGE CAPITALIZATION
and a more complex example with a cell array of strings
--> upper({'This','Is','Strange','CAPitalizaTion'})
ans = 
 [THIS] [IS] [STRANGE] [CAPITALIZATION]