Create a cell array of strings containing the first n natural numbers. Slightly harder than it seems like it should be.
>> y = naturalnumbers(4)
'1' '2' '3' '4'
Find the sum of all the numbers of the input vector
All your base are belong to us
Back to basics 9 - Indexed References
Back to basics 23 - Triangular matrix
Deleting an element in a matrix
Split a string into chunks of specified length
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