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 common elements in matrix rows
It dseon't mettar waht oedrr the lrettes in a wrod are.
The Hitchhiker's Guide to MATLAB
Find the largest value in the 3D matrix
04 - Scalar Equations 1
Simple Caesar Cypher - shift encrypt a message given an index number
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