test is a given integer number is Happy of not?
answer 1 if yes or 0 is no
sorry for that.
Find the peak 3n+1 sequence value
Get the length of a given vector
Return the first and last character of a string
Given a 4x4 matrix, swap the two middle columns
Count decimal digits of a number
Is this number Munchhausen Narcissistic?
Convert a Cell Array into an Array
Tony's trick for duplicating an mx1 vector n times
remove nans fast
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