Most nonzero elements in row
Extract leading non-zero digit
Remove the polynomials that have positive real elements of their roots.
Detect a number and replace with two NaN's
06 - Matrix Equations 2
02 - Vector Variables 2
07 - Common functions and indexing 5
07 - Common functions and indexing 4
05 - Vector Equations 3
04 - Scalar Equations 2
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