OK. I figured out the issue with the test suite. Please check the absolute value of the difference when comparing the computed answers to the correct ones. Otherwise, you'll get some really silly answers. (Like this one! :-)
My, you are tricky, James, finding all those loopholes. I've fixed the test suite to check against upper and lower bounds of each answer.
I was just really curious why one of my answers worked when it didn't include a or b. Some experimentation and a lot of (now wrong) solutions narrowed it down. I had to use some of these equations in my senior project at college, so I knew that the dimensions were very important!
So many choices
Is the Point in a Circle?
Remove the two elements next to NaN value
Convert from Base 10 to base 5
Square Digits Number Chain Terminal Value (Inspired by Project Euler Problem 92)
Pattern Recognition 2 - Known Unit Length, Various Array Length (including cell arrays)
Divisible by 10
Lights Out 8 - 5x5, light-only solution? I
Rule of mixtures (composites) - upper bound
Rule of mixtures (composites) - lower and upper bounds (volumes)
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