This solution is correct to within eps, but the test is expecting exact agreement. That is not good programming when dealing with floating point numbers.
Add two numbers
Return the 3n+1 sequence for n
Find perfect placement of non-rotating dominoes (easier)
Create a patchwork matrix
Only once: cleaning up your columns
Number of problems
Wrap a vector, but insert NaN's at the wrap-positions.
A SUBSREF variant that accepts the 'end'-operator.
Return 'on' or 'off'
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