Updates:
Status: Valid
Labels: Matrices
Comment #1 on issue 3232 by [email protected]: Problem getting eigenvector
resolution of matrix
http://code.google.com/p/sympy/issues/detail?id=3232
Thanks. This definitely looks like a bug. ex.eigenvals() is also empty
(but roots ex.charpoly() works fine). I wonder if this is related to issue
3189.
By the way, S() is a shortcut to sympify(), which converts strings to SymPy
objects, so that's why that is being used (you get better precision if you
convert floating point numbers to SymPy Float directly from the string
form, rather than through a Python float first).
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