Status: Valid
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Labels: Type-Defect Priority-Medium WrongResult Matrices EasyToFix
New issue 3221 by asmeu...@gmail.com: Matrix.charpoly() should include
minus sign for odd order matrices
http://code.google.com/p/sympy/issues/detail?id=3221
The leading term of the characteristic pol
Comment #1 on issue 3221 by mary.spr...@gmail.com: Matrix.charpoly() should
include minus sign for odd order matrices
http://code.google.com/p/sympy/issues/detail?id=3221
From what I can see, the only method for calculating the characteristic
polynomial is the Berkowitz algorithm, which sta
Comment #2 on issue 3221 by asmeu...@gmail.com: Matrix.charpoly() should
include minus sign for odd order matrices
http://code.google.com/p/sympy/issues/detail?id=3221
Probably we should just check if the leading coefficient of x**n in det()
and multiply through by -1 if it isn't already -1
Comment #3 on issue 3221 by khageshp...@gmail.com: Matrix.charpoly() should
include minus sign for odd order matrices
http://code.google.com/p/sympy/issues/detail?id=3221
Is someone at this one because I want to do it.
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Comment #4 on issue 3221 by khageshp...@gmail.com: Matrix.charpoly() should
include minus sign for odd order matrices
http://code.google.com/p/sympy/issues/detail?id=3221
https://github.com/sympy/sympy/pull/1919
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Comment #5 on issue 3221 by matt...@gmail.com: Matrix.charpoly() should
include minus sign for odd order matrices
http://code.google.com/p/sympy/issues/detail?id=3221
Doesn't the sign depend on the definition of characteristic polynomial? To
me the result is correct assuming `charpoly(M) =
Comment #6 on issue 3221 by khageshp...@gmail.com: Matrix.charpoly() should
include minus sign for odd order matrices
http://code.google.com/p/sympy/issues/detail?id=3221
Yes det(t*I-M) will always give monic polynomial but which definition is
used by sympy.Some authors support det(M-t*I) o
Comment #7 on issue 3221 by matt...@gmail.com: Matrix.charpoly() should
include minus sign for odd order matrices
http://code.google.com/p/sympy/issues/detail?id=3221
In berkowitz() and related methods we use det(t*I - M) (see the docstring)
(charpoly() is an alias to berkowitz_charpoly()).
Comment #8 on issue 3221 by khageshp...@gmail.com: Matrix.charpoly() should
include minus sign for odd order matrices
http://code.google.com/p/sympy/issues/detail?id=3221
Then you should close this issue and there is also no point of this patch.
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Comment #9 on issue 3221 by khageshp...@gmail.com: Matrix.charpoly() should
include minus sign for odd order matrices
http://code.google.com/p/sympy/issues/detail?id=3221
Then you can close this issue and there is also no point of this patch.
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Updates:
Status: WontFix
Comment #10 on issue 3221 by asmeu...@gmail.com: Matrix.charpoly() should
include minus sign for odd order matrices
http://code.google.com/p/sympy/issues/detail?id=3221
I didn't realize that it was defined the other way. According to
http://en.wikipedia.org
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