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
Replace NaNs with the number that appears to its left in the row.
Distance walked 2D
Back to basics 6 - Column Vector
02 - Vector Variables 4
Square root of a number
Replace every 3rd element in a vector with 4
Finding an element in a vector
Matlab Basics II - Determine if an array has a 3rd dimension
Matlab Basics II - Intervals
Matlab Basics II - Log and natural log
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