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 3 - Temp Directory
Getting the row and column location from a matrix
Given a matrix, return the last eigen value
Insert zeros into vector
Add a row of zeros on top of a matrix
Matlab Basics II - Intervals
Replace every 3rd element in a vector with 4
Matlab Basics - Set unwanted parts of a vector to zero
Matlab Basics II - Determine if an array has a 3rd dimension
Matlab Basics II - Log and natural log
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