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.
Sum of diagonal of a square matrix
Getting logical indexes
Is the input divisible by 3?
Vectors counting by 2
Matlab Basics - Switching Assignments
find the mean of all elements in a matrix
Find the last digit
Calculating selling price
multiply an array by its position number
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