Status: Accepted
Owner: smichr
Labels: Type-Defect Priority-Medium
New issue 2038 by smichr: powsimp breaks power rules
http://code.google.com/p/sympy/issues/detail?id=2038
(x**(2*y))**3
(x**(2*y))**3
powsimp(_)
(x**(2*y))**3 <--ok, we didn't use the deep flag
powsimp(_,deep=1)
((x**2)**y)
Status: Accepted
Owner: smichr
Labels: Type-Defect Priority-Medium
New issue 2039 by smichr: Mul.eval_subs problems
http://code.google.com/p/sympy/issues/detail?id=2039
Issue 2022 identified a problem with handling of non-commutative terms in a
Mul substitution. There are a couple of other pro
Updates:
Labels: NeedsReview
Blockedon: 2022 2038
Comment #1 on issue 2039 by smichr: Mul.eval_subs problems
http://code.google.com/p/sympy/issues/detail?id=2039
It could also apply some powsimp to terms to get them in standard form
before trying to store them for analysis,
e
Issue 2038: powsimp breaks power rules
http://code.google.com/p/sympy/issues/detail?id=2038
This issue is now blocking issue 2039.
See http://code.google.com/p/sympy/issues/detail?id=2039
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Issue 2022: inconsistent behaviour of subs when using non-commutative
symbols
http://code.google.com/p/sympy/issues/detail?id=2022
This issue is now blocking issue 2039.
See http://code.google.com/p/sympy/issues/detail?id=2039
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Updates:
Blockedon: -2022 -2038
Comment #2 on issue 2039 by smichr: Mul.eval_subs problems
http://code.google.com/p/sympy/issues/detail?id=2039
It's not a commit over anything. It's a single commit at that branch. Issue
2038 is bypassed with a new function, powdenest. I re-wrote the ro
Issue 2038: powsimp breaks power rules
http://code.google.com/p/sympy/issues/detail?id=2038
This issue is no longer blocking issue 2039.
See http://code.google.com/p/sympy/issues/detail?id=2039
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Issue 2022: inconsistent behaviour of subs when using non-commutative
symbols
http://code.google.com/p/sympy/issues/detail?id=2022
This issue is no longer blocking issue 2039.
See http://code.google.com/p/sympy/issues/detail?id=2039
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Updates:
Labels: -NeedsReview
Comment #17 on issue 2022 by smichr: inconsistent behaviour of subs when
using non-commutative symbols
http://code.google.com/p/sympy/issues/detail?id=2022
A patch fixing this issue and several others is given in Issue 2039. I
would recommend that re-wr
Issue 2039: Mul.eval_subs problems
http://code.google.com/p/sympy/issues/detail?id=2039
This issue is now blocking issue 1694.
See http://code.google.com/p/sympy/issues/detail?id=1694
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Updates:
Blockedon: 2039
Comment #138 on issue 1694 by smichr: solve has many issues with fractions
http://code.google.com/p/sympy/issues/detail?id=1694
powdenest breaks assumptions. This routine, however, inspired a fixed
routine that could be used with Mul._eval_subs and is now part
Comment #139 on issue 1694 by smichr: solve has many issues with fractions
http://code.google.com/p/sympy/issues/detail?id=1694
i.e. (x**y)**a is not, in general, x**(y*a). It's only true if y or a is an
integer or x is positive.
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Updates:
Cc: Vinzent.Steinberg
Comment #3 on issue 2039 by smichr: Mul.eval_subs problems
http://code.google.com/p/sympy/issues/detail?id=2039
(No comment was entered for this change.)
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Comment #4 on issue 2039 by julien.rioux: Mul.eval_subs problems
http://code.google.com/p/sympy/issues/detail?id=2039
In branch 2039 I get
In [8]: (a*A*B).subs(a*A,c)
Out[8]:
2
c ⋅B
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Comment #5 on issue 2039 by asmeurer: Mul.eval_subs problems
http://code.google.com/p/sympy/issues/detail?id=2039
The ideal fix for #3 would be to just fix issue 1799.
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Comment #10 on issue 1799 by asmeurer: Replace exp(x) with E**x internally
http://code.google.com/p/sympy/issues/detail?id=1799
That should have been issue 2008.
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Updates:
Blockedon: 2008
Comment #11 on issue 1799 by asmeurer: Replace exp(x) with E**x internally
http://code.google.com/p/sympy/issues/detail?id=1799
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Issue 2008: Inconsistencies for Pow**n and exp***n
http://code.google.com/p/sympy/issues/detail?id=2008
This issue is now blocking issue 1799.
See http://code.google.com/p/sympy/issues/detail?id=1799
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Comment #6 on issue 2039 by smichr: Mul.eval_subs problems
http://code.google.com/p/sympy/issues/detail?id=2039
Re comment 4: How ironic! I didn't put that test in because I knew it
wasn't walking over the end of a list anymore. But it failed for a
different reason this time. Again...nice sl
Comment #7 on issue 2039 by julien.rioux: Mul.eval_subs problems
http://code.google.com/p/sympy/issues/detail?id=2039
In [6]: (x*A*x*x).subs(x**2*A,y)
Out[6]:
2
y⋅x
In [7]: (x*A*x*B).subs(x**2*A,y)
Out[7]: x⋅y⋅B
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Comment #8 on issue 2039 by smichr: Mul.eval_subs problems
http://code.google.com/p/sympy/issues/detail?id=2039
Are you using anything to help find the expressions that break it? (Like
the random expression generator that was discussed recently.) I was
challenged by your finds to come up wit
Comment #9 on issue 2039 by julien.rioux: Mul.eval_subs problems
http://code.google.com/p/sympy/issues/detail?id=2039
No, I just tried simple expressions and got lucky. Looks solid this time.
Thanks for fixin' and cheers.
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Status: Accepted
Owner: asmeurer
Labels: Type-Defect Priority-Medium Polynomial Integration
New issue 2040 by asmeurer: Better way to make a rational function out of
an expression
http://code.google.com/p/sympy/issues/detail?id=2040
In the Risch Algorithm (issue 2010), I need to convert the e
Issue 2040: Better way to make a rational function out of an expression
http://code.google.com/p/sympy/issues/detail?id=2040
This issue is now blocking issue 2010.
See http://code.google.com/p/sympy/issues/detail?id=2010
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Updates:
Blockedon: 2040
Comment #10 on issue 2010 by asmeurer: Integration with the full Risch
Algorithm
http://code.google.com/p/sympy/issues/detail?id=2010
(No comment was entered for this change.)
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"symp
Updates:
Cc: -Vinzent.Steinberg
Comment #10 on issue 2039 by smichr: Mul.eval_subs problems
http://code.google.com/p/sympy/issues/detail?id=2039
Thanks for the feedback and testing. Just out of curiosity, what sort of
manipulations do you do with non-commutatives?
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Comment #1 on issue 2040 by smichr: Better way to make a rational function
out of an expression
http://code.google.com/p/sympy/issues/detail?id=2040
Sorry if this is too specific, but what about:
eq = sqrt(log(x**2 + 3*x + 2)*(log(x + 1) + log(x + 2)))
eq = eq.subs(dict((a,factor(a)) for a
Comment #2 on issue 2040 by asmeurer: Better way to make a rational
function out of an expression
http://code.google.com/p/sympy/issues/detail?id=2040
So I apologize for not being clear. The expression I need to be able to
work with is sqrt(t0**2 + 2*t0*t1 + t1**2). The other parts of my
Comment #3 on issue 2040 by smichr: Better way to make a rational function
out of an expression
http://code.google.com/p/sympy/issues/detail?id=2040
So perhaps you can just factor the args of all rational powers:
eq.subs(dict([(a,factor(a.base)**a.exp) for a in eq.atoms(Pow) if
a.exp.q !=
Comment #4 on issue 2040 by smichr: Better way to make a rational function
out of an expression
http://code.google.com/p/sympy/issues/detail?id=2040
Hopefully that will work in polys11 with the new changes that Matteusz has
made since in sympy live I get the following when trying to factor
Comment #10 on issue 1916 by mybeky: Plotting fails: Window initialization
failed: Unable to share contexts
http://code.google.com/p/sympy/issues/detail?id=1916
it's can be fixed like this:
os.environ['PYGLET_SHADOW_WINDOW']="0"
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