I really don't see the point of that kind of problems where you can't use Matlab built-in functions.
Find relatively common elements in matrix rows
Celsius to Kelvin
Is the input divisible by 3?
Find all the zeros of sinus , cosinus and tangent in a given interval
Combinations without using nchoosek
Set the array elements whose value is 13 to 0
Unique values without using UNIQUE function
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