the "sorted" requirement is problematic, I would suggest you drop this requirement and simply resort the output of cubicFormula after (not before) rounding to four digits (and apply the same logic to your testsuite)...
is there maybe a several problem with the sorting method you describe/need?? :-/
The problem requires abs as 'ComparisonMethod' for sorting and the non-conjugate transpose. That's a pain that I have just become aware: ' is the conjugate transpose, and .' is the non-conjugate transpose. The conjugate operator changes the signs of complex roots.
Read a column of numbers and interpolate missing data
Project Euler: Problem 8, Find largest product in a large string of numbers
Insert zeros into vector
Create Volcano (or Atoll) martix. It is an extension of Bullseye matrix problem.
Simple Caesar Cypher - shift encrypt a message given an index number
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