#17124: Matrix constructor broken for symmetric function rings and 1-column
matrices
------------------------------------------------+--------------------------
Reporter: darij | Owner:
Type: defect | Status:
Priority: major | needs_review
Component: linear algebra | Milestone: sage-6.4
Keywords: matrix, symmetric functions, | Resolution:
Authors: | Merged in:
Report Upstream: N/A | Reviewers:
Branch: | Work issues:
Dependencies: | Commit:
| Stopgaps:
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Comment (by darij):
Fixed in branch public/linalg/uglyduck. I am not happy with the way it
went, but at least I can't reproduce the bug anymore. There is now some
precision issues:
{{{
sage -t src/sage/matrix/matrix2.pyx
**********************************************************************
File "src/sage/matrix/matrix2.pyx", line 5209, in
sage.matrix.matrix2.Matrix.diagonal.eigenspaces_right
Failed example:
eigenvalues = em[0]; eigenvalues.dense_matrix().zero_at(1e-15)
Expected:
[ 13.348469228349... 0.0 0.0]
[ 0.0 -1.348469228349... 0.0]
[ 0.0 0.0 0.0]
Got:
[13.348469228349522 0.0 0.0]
[ 0.0 -1.348469228349534 0.0]
[ 0.0 0.0 0.0]
**********************************************************************
File "src/sage/matrix/matrix2.pyx", line 5689, in
sage.matrix.matrix2.Matrix.diagonal.eigenmatrix_right
Failed example:
evalues = em[0]; evalues.dense_matrix().zero_at(2e-15)
Expected:
[ 13.348469228349... 0.0 0.0]
[ 0.0 -1.348469228349... 0.0]
[ 0.0 0.0 0.0]
Got:
[13.348469228349522 0.0 0.0]
[ 0.0 -1.348469228349534 0.0]
[ 0.0 0.0 0.0]
**********************************************************************
File "src/sage/matrix/matrix2.pyx", line 12207, in
sage.matrix.matrix2.Matrix.diagonal.norm
Failed example:
A.norm()
Expected:
15.0
Got:
14.999999999999998
**********************************************************************
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/17124#comment:3>
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