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
The Hitchhiker's Guide to MATLAB
Min of a Matrix
Matlab Basics - Set unwanted parts of a vector to zero
Multiply by 3
Matlab Basics II - Create a vector with a repeated entry
Finding an element in a vector
Matlab Basics II - Intervals
Matlab Basics - Logical Tests I
Matlab Basics - Create a row vector
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