if you're going to post trivial problems that have already been posted before, at least use a proper test suite.
and this one does not even require a solution
Create incrementing array
construct matrix with identical rows
Matlab Basics - Logical Tests I
Summation of array
Matlab Basics II - Free Fall
Matlab Basics - Pick out parts of a vector
Matlab Basics II - Count rows in a matrix
Replace every 3rd element in a vector with 4
Finding an element in a vector
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