It would be better to add more test cases to reinforce the test suite.
Thanks I just updated!
Using without the "round" fudge on the polyfit function should work, but gives errors on the order of 1e-14. Round only works because all the coefficients in your test suite are integers.
Swap the first and last columns
surface of a spherical planet
Back to basics 25 - Valid variable names
Sum the entries of each column of a matrix which satisfy a logical condition.
Negation the hard way
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