I'm running Mac OS X 10.6.1.  The command matrix.eigenvalues() has
stopped working, as follows:

wombat:sgwork chris$ sage
----------------------------------------------------------------------
| Sage Version 4.1, Release Date: 2009-07-09                         |
| Type notebook() for the GUI, and license() for information.        |
----------------------------------------------------------------------
sage: C = graphs.CycleGraph(5)
sage: A = C.am()
sage: A.eigenvalues()
---------------------------------------------------------------------------
RuntimeError                              Traceback (most recent call
last)

/Users/chris/Code/sgwork/<ipython console> in <module>()

/Applications/sage/local/lib/python2.6/site-packages/sage/matrix/
matrix2.so in sage.matrix.matrix2.Matrix.eigenvalues (sage/matrix/
matrix2.c:19901)()

/Applications/sage/local/lib/python2.6/site-packages/sage/matrix/
matrix2.so in sage.matrix.matrix2.Matrix.fcp (sage/matrix/matrix2.c:
8560)()

/Applications/sage/local/lib/python2.6/site-packages/sage/matrix/
matrix_integer_dense.so in
sage.matrix.matrix_integer_dense.Matrix_integer_dense.charpoly (sage/
matrix/matrix_integer_dense.c:10599)()

/Applications/sage/local/lib/python2.6/site-packages/sage/matrix/
matrix_integer_dense.so in
sage.matrix.matrix_integer_dense.Matrix_integer_dense._charpoly_linbox
(sage/matrix/matrix_integer_dense.c:11242)()

RuntimeError:

----------------------
Thanks for any help

Chris Godsil

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