Updates:
Labels: NeedsReview
Comment #3 on issue 1495 by smichr: minus problem
http://code.google.com/p/sympy/issues/detail?id=1495
I've pushed to smichr on github a version with changes to simplify,
could_extract_minus, extract_multiplicatively, (and fastlog). I fixed the
infinite
recursion problem and added a couple of tests. Some of the tests failed
because now
there is a different ordering of terms in a solution (e.g. (b-a)/(d-c)
instead of
(a-b)/(c-d) sorts of things) so I changed those tests, otherwise everything
is the
same, I believe.
The issue of how -x*(-2*a*x - 2*x**3) is presented canonically hasn't been
solved: it
still doesn't appear as x*(2*a*x+2*x**3) on its own. And when you simplify
it, you get:
###
>>> simplify(-x*(-2*a*x - 2*x**3))
2*a*x**2 + 2*x**4
###
coverage is a pretty cool tool!
Here are some "breadcrumbs" from my use of it on Windows XP:
============================
= I used the windows installer to install Coverage 3.01
= I made a copy of the __init__.py file, in the site-packages\coverage
folder, and
named it __main__.py
= in a cmd window while located in a git repository of sympy at path
sympy/sympy:
\python26\python.exe ..\bin\coverage_report.py sympy/core
^__ this line runs the coverage_report on everything in sympy/core,
creating a
report in ..
\python26\python.exe ..\bin\test sympy
^__ this runs ALL the tests.
/c
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