find the first elements of a column matrix
This would be better as "find the nth element of an array." Also, a column matrix doesn't exist. Perhaps you meant column vector, though the variables in your test cases are row vectors.
Swap two numbers
Are you in XY plane?
Matlab Basics - Convert a row vector to a column vector
Matlab Basics - Set unwanted parts of a vector to zero
modulus of a number
Find remainder when x is divided by 3
Determine whether the input is divisible by 3 as well as 5
Calculating selling price
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