The problem description is broken(?) and you have mentioned the code in the test suite (you might want to remove that)
The test suite has had the "solution" code removed. The description was also cleaned up. (If it's not loading, simply reload the page.) I'm not sure how much these fixes help, though...
Remove all the consonants
Find all elements less than 0 or greater than 10 and replace them with NaN
Detect a number and replace with two NaN's
Sum the elements in either diagonal of a square matrix
y equals x divided by 2
is the number happy?
Convert vector datasets to plot with imagesc instead of scatter
Is this number Munchhausen Narcissistic?
remove nans fast
Strange Number Algorithms
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