Updates:
Labels: -NeedsReview NeedsBetterPatch
Comment #18 on issue 1766 by asmeurer: expand(power_base=True) is too
aggressive
http://code.google.com/p/sympy/issues/detail?id=1766
Regarding the changes to test_nth_linear_constant_coeff_homogeneous, what
caused the change, for example
Comment #3 on issue 1777 by asmeurer: powsimp modifications
http://code.google.com/p/sympy/issues/detail?id=1777
Yes, powers associate to the right by default in Python, as opposed to
every other operator, which associate to the left. I actually
meant (x**y)**z, which under proper assumptions
Comment #2 on issue 1777 by smichr: powsimp modifications
http://code.google.com/p/sympy/issues/detail?id=1777
The expression in the initial comment is not the same as the one that you
gave. The
current branch does behave like you point out:
>>> from sympy import *
>>> var('x y z')
(x, y, z)
>
Comment #7 on issue 1778 by Vinzent.Steinberg: Rational from string can be
improved
http://code.google.com/p/sympy/issues/detail?id=1778
This should be indeed fixed.
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Comment #6 on issue 1778 by asmeurer: Rational from string can be improved
http://code.google.com/p/sympy/issues/detail?id=1778
Well, it needs to do type checking. I guess the real question is, why does
anything other than sympify try to
convert strings into sympy expressions? And if it does,
Comment #5 on issue 1778 by Vinzent.Steinberg: Rational from string can be
improved
http://code.google.com/p/sympy/issues/detail?id=1778
> In fact, is there a good reason why we don't just put this all in sympify
> and have
Rational call sympify?
Performance and continuity. Imagine you call
Comment #4 on issue 1778 by asmeurer: Rational from string can be improved
http://code.google.com/p/sympy/issues/detail?id=1778
We should fix sympify to do that too:
In [2]: sympify('0.[3]')
TypeError: 'Zero' object is unsubscriptable
In fact, is there a good reason why we don't just put this a
Status: New
Owner:
Labels: Type-Defect Priority-Medium
New issue 1779 by moritzkrauss: When atan2 is used, expression can not be
differentiated anymore.
http://code.google.com/p/sympy/issues/detail?id=1779
diff and jabobian do not work with atan2(a,b)
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Comment #3 on issue 1778 by smichr: Rational from string can be improved
http://code.google.com/p/sympy/issues/detail?id=1778
Yes...please check now.
Regarding '.[3]', that's an existing instantiation for Rational meaning
0.333 The
problem is that you used to have to put a 0 in from of it
