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New issue 4003 by spoo...@abv.bg: Cannot return general quartic solution
http://code.google.com/p/sympy/issues/detail?id=4003
What I am trying to do is this:
In [1]: var('a b c d e x')
Out[1]: (a, b, c, d, e, x)
In [2]: solve( a*x**4
Updates:
Status: Valid
Labels: Solvers
Comment #1 on issue 4003 by asmeu...@gmail.com: Cannot return general
quartic solution
http://code.google.com/p/sympy/issues/detail?id=4003
What do Sage or Wolfram give? If I remember correctly, there is some term
in the general quartic
Comment #2 on issue 4003 by asmeu...@gmail.com: Cannot return general
quartic solution
http://code.google.com/p/sympy/issues/detail?id=4003
OK, some more details are at issue 1890 (see also the docstring of
roots_quartic in sympy/polys/polyroots.py).
The issue is that it needs to know if
Comment #3 on issue 4003 by spoo...@abv.bg: Cannot return general quartic
solution
http://code.google.com/p/sympy/issues/detail?id=4003
Well if all of the coefficients are not zero, the general solution (
https://upload.wikimedia.org/wikipedia/commons/9/99/Quartic_Formula.svg )
should wor
Comment #4 on issue 4003 by spoo...@abv.bg: Cannot return general quartic
solution
http://code.google.com/p/sympy/issues/detail?id=4003
It doesn't look like a very complicated problem, but I can't fix it. I'm
afraid not to break anything. It seems that the current code is chosen to
work w
Comment #5 on issue 4003 by asmeu...@gmail.com: Cannot return general
quartic solution
http://code.google.com/p/sympy/issues/detail?id=4003
You don't have to worry about not breaking things. We have an extensive
test suite to guard against that.
It seems that the current code is chosen t
Comment #6 on issue 4003 by smi...@gmail.com: Cannot return general quartic
solution
http://code.google.com/p/sympy/issues/detail?id=4003
For posterity, here are those 4 equations for the equation x**4 + a*x**3 +
b*x**2 + c*x + d = 0:
TH = Rational(1, 3)
g = b**2 - 3*a*c + 12*d
Updates:
Labels: NeedsReview smichr
Comment #7 on issue 4003 by smi...@gmail.com: Cannot return general quartic
solution
http://code.google.com/p/sympy/issues/detail?id=4003
https://github.com/sympy/sympy/pull/2926
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Updates:
Status: Fixed
Comment #8 on issue 4003 by smi...@gmail.com: Cannot return general quartic
solution
http://code.google.com/p/sympy/issues/detail?id=4003
piecewise is now returned
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