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.
Find the numeric mean of the prime numbers in a matrix.
Project Euler: Problem 3, Largest prime factor
Back to basics 8 - Matrix Diagonals
Back to basics 14 - Keywords
Find the index of the largest value in any vector X=[4,3,4,5,9,12,0,4.....5]
Simple Caesar Cypher - shift encrypt a message given an index number
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