#17126: Floating-point precision issues fail matrix2.py doctests
-------------------------+-------------------------------------------------
Reporter: darij | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.4
Component: PLEASE | Keywords: doctest failure, floating
CHANGE | point, precision, matrix
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
-------------------------+-------------------------------------------------
This is on the develop branch at version 6.4beta4:
{{{
darij@travis-virtualbox:~/gitsage$ ./sage -bt src/sage/matrix/matrix2.pyx
scons: `install' is up to date.
Updating Cython code....
Enabling Cython debugging support
Finished Cythonizing, time: 6.46 seconds.
Discovering Python source code....
Discovered Python source, time: 0.03 seconds.
Cleaning up stale installed files....
- cleaning /home/darij/sage-6.3.beta6/local/lib/python2.7/site-packages
- cleaning /home/darij/sage-6.3.beta6/local/lib/site-python
- cleaning /home/darij/sage-6.3.beta6/src/build/lib.linux-i686-2.7
Finished cleaning, time: 0.14 seconds.
running install
running build
running build_py
running build_ext
Executing 0 commands (using 1 thread)
Time to execute 0 commands: 0.11 seconds.
Total time spent compiling C/C++ extensions: 0.31 seconds.
running install_lib
running install_egg_info
Removing /home/darij/sage-6.3.beta6/local/lib/python2.7/site-
packages/sage-6.4.beta4-py2.7.egg-info
Writing /home/darij/sage-6.3.beta6/local/lib/python2.7/site-
packages/sage-6.4.beta4-py2.7.egg-info
too many failed tests, not using stored timings
Running doctests with ID 2014-10-09-21-38-47-a9d849b9.
Doctesting 1 file.
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
**********************************************************************
3 items had failures:
1 of 19 in sage.matrix.matrix2.Matrix.diagonal.eigenmatrix_right
1 of 24 in sage.matrix.matrix2.Matrix.diagonal.eigenspaces_right
1 of 18 in sage.matrix.matrix2.Matrix.diagonal.norm
[2116 tests, 3 failures, 17.51 s]
----------------------------------------------------------------------
sage -t src/sage/matrix/matrix2.pyx # 3 doctests failed
----------------------------------------------------------------------
Total time for all tests: 18.4 seconds
cpu time: 16.5 seconds
cumulative wall time: 17.5 seconds
}}}
I suspect I should post some system info, but I don't know what kind of,
so I fear you'll have to worm it out of me. Here is some random data:
{{{
darij@travis-virtualbox:~/gitsage$ lscpu
Architecture: i686
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 2
On-line CPU(s) list: 0,1
Thread(s) per core: 1
Core(s) per socket: 2
Socket(s): 1
Vendor ID: GenuineIntel
CPU family: 6
Model: 42
Stepping: 7
CPU MHz: 1973.427
BogoMIPS: 3943.87
L1d cache: 32K
L1d cache: 32K
L2d cache: 6144K
darij@travis-virtualbox:~/gitsage$ uname -a
Linux travis-virtualbox 3.2.0-69-generic #103-Ubuntu SMP Tue Sep 2
05:03:16 UTC 2014 i686 i686 i386 GNU/Linux
darij@travis-virtualbox:~/gitsage$ uname -m
i686
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/17126>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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