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.
Most nonzero elements in row
Who is the smartest MATLAB programmer?
Matrix to column conversion
Find Out sum of principal diagonal element of given matrix
UICBioE240 problem 1.2
Determine whether the input is divisible by 3 as well as 5
Find the last digit
find the mean of all elements in a matrix
find a specific element from an matrix
modulus of a number
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