Using explicit iteration is not the most efficient way of solving this problem, but if you do choose to iterate I would suggest using "linear indexing", per https://au.mathworks.com/help/matlab/math/matrix-indexing.html?s_tid=doc_srchtitle#f1-85511
sum of non-primes
Who invented zero?
Let's get back to school, and create multiplication tables
Find the area of the four walls
Average of even-numbered columns
Probability of red tulips
Calculate feeling temperature before climbing a mountain
Delete the column with all 0 in the TABLE
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