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.
Omit columns averages from a matrix
Sum of the Matrix Elements
Matlab Basics II - Extract last 3 elements of a vector
UICBioE240 problem 1.4
Find the last digit
multiply an array by its position number
find a specific element from an matrix
find the mean of all elements in a matrix
Find remainder when x is divided by 3
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