I really don't see the point of that kind of problems where you can't use Matlab built-in functions.
Remove the polynomials that have positive real elements of their roots.
vectorization in N
Find out missing number from a vector of 9 elements
Flip the vector from right to left
Sophie Germain prime
Remove the two elements next to NaN value
Angle between two vectors
Number of bytes required to store a sparse matrix
Convert a numerical matrix into a cell array of strings
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