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Comment #6 on issue 1468 by smichr: problems with quartic root solver
http://code.google.com/p/sympy/issues/detail?id=1468
I've attached a patch which replaces the old quartic solver with a new one
that does
not seem to exhibit the same problem. There are a variety of other changes,
including
an option now to initialize roots() with a tuple:
roots((a,b,c)) -> gives solution to ax^2+bx+c
I also decided to make the quartic and cubic routines complete rather than
quick but
incomplete. e.g. if a polynomial is sent to roots, roots would never pass
it on to
quartic or cubic with the constant being 0 because that case could be
factored. But
since someone might want to compare the roots (smart) root and the naive
root from
quartic or cubic, I made them both complete.
All changes are annotated in the patch.
/c
Attachments:
0001-new-quartic-routine-cubic-mods-misc-changes.patch 21.5 KB
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