Hi,
I need to performe a (numerical) cholesky factorization of a sparse
matrix (20x20) but I'm getting a error.
I look at this thread
https://groups.google.com/forum/?fromgroups=#!searchin/sage-devel/cholesky/sage-devel/AW4pmKx49H4/7iuet3rWYQgJ
but it didn't help very much (and is a little old).
Bellow a minimal example of the problem.
{{{
sage: D = matrix(RDF, 2, 2, [[1, 1],[1,2]])
sage: D
[1.0 1.0]
[1.0 2.0]
sage: D.cholesky()
[1.0 0.0]
[1.0 1.0]
sage: D = matrix(RDF, 2, 2, [[1, 1],[1,2]], sparse=True)
sage: D
[1.0 1.0]
[1.0 2.0]
sage: D.cholesky()
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
/home/raniere/documents/cnpq_126874_2012-3/src_sage/<ipython console>
in <module>()
/home/raniere/opt/sage/local/lib/python2.7/site-packages/sage/matrix/matrix2.so
in sage.matrix.matrix2.Matrix.cholesky (sage/matrix/matrix2.c:47860)()
TypeError: base ring of the matrix must be exact, not Real Double Field
}}}
Thanks,
Raniere
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