test is a given integer number is Happy of not?
answer 1 if yes or 0 is no
sorry for that.
Remove the polynomials that have positive real elements of their roots.
Doubling elements in a vector
Test if two numbers have the same digits
02 - Vector Variables 3
Narcissistic number ?
Magic Concentric Circles
remove nans fast
Tony's trick for duplicating an mx1 vector n times
Convert a Cell Array into an Array
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