test is a given integer number is Happy of not?
answer 1 if yes or 0 is no
sorry for that.
Vectorizing, too easy or too hard?
Getting the row and column location from a matrix
Find a subset that divides the vector into equal halves
Change the sign of even index entries of the reversed vector
Hard limit function
Magic Concentric Circles
provide the numerical answer to these number questions...
Tony's trick for duplicating an mx1 vector n times
Create numeric palindromes and their square roots
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