I think you have your W and H mixed up in your example and test suite.
Thanks James, I've fixed it now.
I also used round, but I not seen to be the best solution.
36.6/20.6==16/9 is false.
The values from the test suite are also inaccurate.
Project Euler: Problem 3, Largest prime factor
Back to basics 26 - Keywords
Sum the 'edge' values of a matrix
Plot Damped Sinusoid
Square Digits Number Chain Terminal Value (Inspired by Project Euler Problem 92)
Cache me Outside
Determine if a Given Number is a Triangle Number
Guess the Coefficients!
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