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.
surface of a spherical planet
The Hitchhiker's Guide to MATLAB
Back to basics 1 - Saving
modulus of a number
Find remainder when x is divided by 3
find the mean of all elements in a matrix
multiply an array by its position number
Calculating selling price
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