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
Most nonzero elements in row
Get the length of a given vector
Find the nearest integer
07 - Common functions and indexing 5
Find the area of a triangle
Matlab Basics II - Determine if an array has a 3rd dimension
Matlab Basics II - Find the roots of a function
Matlab Basics II - Max & Index of Max
Matlab Basics II - 3 Dimensional Arrays
Matlab Basics - Convert a row vector to a column vector
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