回答済み How to convert a vector to be a string
You don't need a cell array for this problem and your make_string function has errors. See doc 'cell arrays'.
If you want a com...
You can also select a web site from the following list:
How to Get Best Site Performance
Select the China site (in Chinese or English) for best site performance. Other MathWorks country sites are not optimized for visits from your location.