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
Count decimal digits of a number
Rounding off numbers to n decimals
Sum of the Multiplication of Vectors
Replace every 3rd element in a vector with 4
Matlab Basics II - Find the roots of a function
Matlab Basics II - Log and natural log
Matlab Basics II - Count rows in a matrix
Matlab Basics - Pick out parts of a vector
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