Really fun problem, but the test case is totally wrong. :-(
glad you liked the problem, but the test case is correct just obfuscated.
Angle between Two Vectors
find the roots of a quadratic equation
Put Two 1D matrices into one 1D matrix
Create numeric palindromes and their square roots
Tony's trick for duplicating an mx1 vector n times
remove nans fast
Convert vector datasets to plot with imagesc instead of scatter
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