test is a given integer number is Happy of not?
answer 1 if yes or 0 is no
sorry for that.
Replace NaNs with the number that appears to its left in the row.
Sum of diagonal of a square matrix
Area of a Square
Vectors counting by 2
Magic Concentric Circles
Convert vector datasets to plot with imagesc instead of scatter
Tony's trick for duplicating an mx1 vector n times
Is this number Munchhausen Narcissistic?
Strange Number Algorithms
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