#7852: solve_left for RDF matrices is WRONG
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Reporter: was | Owner: was
Type: defect | Status: new
Priority: major | Milestone: sage-4.3.1
Component: linear algebra | Keywords:
Work_issues: | Author:
Upstream: N/A | Reviewer:
Merged: |
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Observe the docstring for solve_left for an RDF matrix:
{{{
sage: A = random_matrix(RDF,3)
sage: A.solve_left?
Solve the equation A*x = b, where
EXAMPLES:
sage: A = matrix(RDF, 3,3, [1,2,5,7.6,2.3,1,1,2,-1]); A
[ 1.0 2.0 5.0]
[ 7.6 2.3 1.0]
[ 1.0 2.0 -1.0]
sage: b = vector(RDF,[1,2,3])
sage: x = A.solve_left(b); x
(-0.113695090439, 1.39018087855, -0.333333333333)
sage: A*x
(1.0, 2.0, 3.0)
}}}
But that is solve_right.
This was evidently introduced by maybe Grout's "Switch the RDF and CDF
matrices to a numpy 1.2 backend; factor out common functionality to
matrix_double_dense.pyx.".
Reported by Stephanie Dietzel
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7852>
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