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Section: Operating System Functions
The fullfile routine constructs a full filename from a set of pieces, namely, directory names and a filename. The syntax is: 
x = fullfile(dir1,dir2,...,dirn,filename)
 where each of the arguments are strings. The fullfile function is equivalent to [dir1 dirsep dir2 dirsep ... dirn dirsep filename]. 
--> fullfile('path','to','my','file.m')
ans = 
path/to/my/file.m