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
Back to basics 6 - Column Vector
The sum of the numbers in the vector
Matrix to column conversion
length of a vector
Matlab Basics - Create a row vector
Matlab Basics II - Log and natural log
Matlab Basics II - 3 Dimensional Arrays
Matlab Basics II - Velocity of a particle
Replace every 3rd element in a vector with 4
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