When the input is true, return 'on', otherwise, return 'off'.
The problem statement is misleading. 'if x' and 'if isequal(x, true)' are different conditions.
sum of non-primes
Derivative of polynomial
Generate a NaN...on purpose
Is it a number?
Insert structure in a parameter-cell array.
Order of things - 3
Order of things - 1
Remove element(s) from cell array
Only once: cleaning up your columns
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