Comment #4 on issue 2009 by mattpap: Document why solve((x-y,y),x) is None
http://code.google.com/p/sympy/issues/detail?id=2009
I disagree with comment #1. Currently solve([x - y, y], x) returns None but
solve(x - y, x) returns [y]. In SymPy, solve([x - y, y], x) means
solve([Eq(x - y, 0),
Comment #5 on issue 2009 by torstenm...@googlemail.com: Document why
solve((x-y,y),x) is None
http://code.google.com/p/sympy/issues/detail?id=2009
What is described in comment #4 is what I would also expect. I am currently
working on the patch for documenting the actual behavior but would
Comment #6 on issue 2009 by torstenm...@googlemail.com: Document why
solve((x-y,y),x) is None
http://code.google.com/p/sympy/issues/detail?id=2009
Announced patch resulting from comment #1-#3. Please review and provide
feedback.
Attachments:
2009_1.diff 1.3 KB
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Labels: NeedsReview
Comment #3 on issue 2005 by smichr: (x**(2*y)).subs(exp(3*y*log(x)), z)
gives z**(3/2) instead of z**(2/3)
http://code.google.com/p/sympy/issues/detail?id=2005
OK, let's take this in smaller pieces. Instead of reviewing and accepting
1836, could we just
Updates:
Cc: -basti.kr asmeurer
Comment #4 on issue 2005 by smichr: (x**(2*y)).subs(exp(3*y*log(x)), z)
gives z**(3/2) instead of z**(2/3)
http://code.google.com/p/sympy/issues/detail?id=2005
(No comment was entered for this change.)
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Comment #7 on issue 2009 by asmeurer: Document why solve((x-y,y),x) is None
http://code.google.com/p/sympy/issues/detail?id=2009
Often what Maple or Mathematica does is cited because we know that they
have already faced the same problems we have and have probably come up with
a good
Updates:
Labels: Integration
Comment #5 on issue 1097 by asmeurer: Poly.integrate() crash, but
integrate(Poly) work
http://code.google.com/p/sympy/issues/detail?id=1097
pi**2/2 is better than 1/2*pi**2 because you can copy and paste it.
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Owner: asmeurer
Labels: Integration
Comment #9 on issue 829 by asmeurer: Improve simplify() to handle result
from integrate(log(k**2-m**2), k)
http://code.google.com/p/sympy/issues/detail?id=829
This is what it is going to look like with the new Risch integrator:
Comment #1 on issue 2010 by asmeurer: Integration with the full Risch
Algorithm
http://code.google.com/p/sympy/issues/detail?id=2010
I have added a handle_first kwarg to risch_integrate(), which changes how
the extension is build. If handle_first == 'log' (the default right now),
then
Comment #3 on issue 2010 by asmeurer: Integration with the full Risch
Algorithm
http://code.google.com/p/sympy/issues/detail?id=2010
Here we can see the trade-off: heuristic Risch algorithm is simple to
implement and can handle lots of
special cases, but can't prove anything; on contrary
Comment by torstenm...@googlemail.com:
Is it possible that hg/ mercurial was used in the past and now it is git?
Yesterday, I successfully checked out with git.
For more information:
http://code.google.com/p/sympy/wiki/SympyDevelopment
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Comment #8 on issue 2009 by torstenm...@googlemail.com: Document why
solve((x-y,y),x) is None
http://code.google.com/p/sympy/issues/detail?id=2009
I have read the code for solve and the functions called by itself.
As #4 changes the API/ interface of solve IMHO the user community should be
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