Comment #11 on issue 3148 by smi...@gmail.com: Too many constants from
dsolve()
http://code.google.com/p/sympy/issues/detail?id=3148
A simpler example of renumbering doing the wrong thing (?) is
constant_renumber(C1/(C1*x + 1), C, 1, 2) - C1/(C2*x + 1)
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New issue 3851 by smi...@gmail.com: separable_reduced dsolve solution
incorrect?
http://code.google.com/p/sympy/issues/detail?id=3851
dsolve(eq, hint='separable_reduced')
log(x*f(x)) - log(x*f(x) - 1) == C1 + log(x)
sol=_
Comment #1 on issue 3851 by smi...@gmail.com: separable_reduced dsolve
solution incorrect?
http://code.google.com/p/sympy/issues/detail?id=3851
In the above, eq = sin(x)*cos(f(x)) + cos(x)*sin(f(x))*f(x).diff(x)
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Comment #12 on issue 3148 by smi...@gmail.com: Too many constants from
dsolve()
http://code.google.com/p/sympy/issues/detail?id=3148
And here's another simpler case where the numbering issue can be seen:
Here is a differential equation
eq
x**2*f(x)**2 + x*Derivative(f(x), x)
The
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CC: julien.r...@gmail.com
Labels: Type-Defect Priority-Medium Integration
New issue 3852 by asmeu...@gmail.com: Multiple integrals with piecewise
should be smarter
http://code.google.com/p/sympy/issues/detail?id=3852
integrate(y*cos(x*y), x, y)
⌠
⎮ ⎧
Comment #1 on issue 3852 by asmeu...@gmail.com: Multiple integrals with
piecewise should be smarter
http://code.google.com/p/sympy/issues/detail?id=3852
I guess I can just use a polynomial for my tutorial.
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New issue 3853 by smi...@gmail.com: recognize elliptical integrals
http://code.google.com/p/sympy/issues/detail?id=3853
This requires about 2 minutes
Ellipse((0,0),3,1).circumference.n()
13.3648932205553
This is nearly
Comment #13 on issue 3148 by asmeu...@gmail.com: Too many constants from
dsolve()
http://code.google.com/p/sympy/issues/detail?id=3148
Exactly. The bug here is in constantsimp, not checkodesol, which cannot
help it if constantsimp returns what is basically a wrong result.
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Labels: Solvers
Comment #2 on issue 3851 by asmeu...@gmail.com: separable_reduced dsolve
solution incorrect?
http://code.google.com/p/sympy/issues/detail?id=3851
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Comment #3 on issue 3851 by asmeu...@gmail.com: separable_reduced dsolve
solution incorrect?
http://code.google.com/p/sympy/issues/detail?id=3851
I didn't know about _random. That's a useful method. We should give it a
better name and expose it to the public API (remove the leading
Updates:
Labels: Geometry
Comment #2 on issue 3853 by asmeu...@gmail.com: recognize elliptical
integrals
http://code.google.com/p/sympy/issues/detail?id=3853
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Labels: Integration
Comment #1 on issue 3853 by asmeu...@gmail.com: recognize elliptical
integrals
http://code.google.com/p/sympy/issues/detail?id=3853
What is the actual integral being computed?
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Comment #9 on issue 1769 by asmeu...@gmail.com: cos(oo) should return nan
http://code.google.com/p/sympy/issues/detail?id=1769
This comes up with a bunch of functions, actually. If evaluation at oo is
not specifically defined in eval(), it is left alone. This leads to a lot
of wrong
Comment #8 on issue 1769 by asmeu...@gmail.com: cos(oo) should return nan
http://code.google.com/p/sympy/issues/detail?id=1769
One issue with sin(oo) is that it is not treated like nan in the core:
In [74]: sin(oo)/oo
Out[74]: 0
(note that limit(sin(x)/x, x, oo) is 1).
This is because
Updates:
Blockedon: sympy:3148
Comment #4 on issue 3851 by asmeu...@gmail.com: separable_reduced dsolve
solution incorrect?
http://code.google.com/p/sympy/issues/detail?id=3851
I guess the source of this problem is described in issue 3148.
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Issue 3148: Too many constants from dsolve()
http://code.google.com/p/sympy/issues/detail?id=3148
This issue is now blocking issue sympy:3851.
See http://code.google.com/p/sympy/issues/detail?id=3851
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Updates:
Status: Fixed
Comment #14 on issue 3434 by asmeu...@gmail.com: warning when starting
isympy
http://code.google.com/p/sympy/issues/detail?id=3434
https://github.com/sympy/sympy/pull/2101
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Comment #11 on issue 3427 by asmeu...@gmail.com: sympy imports matplotlib
on start-up
http://code.google.com/p/sympy/issues/detail?id=3427
https://github.com/sympy/sympy/pull/2101 was merged, but was only a partial
fix.
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Status: Fixed
Comment #4 on issue 3761 by julien.r...@gmail.com: incorrect integral
evaluation
http://code.google.com/p/sympy/issues/detail?id=3761
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Comment #4 on issue 3852 by asmeu...@gmail.com: Multiple integrals with
piecewise should be smarter
http://code.google.com/p/sympy/issues/detail?id=3852
I'm unsure about reducing that piecewise, especially if we adopt the
programming type convention that was preferred back in
Comment #12 on issue 3427 by hacm...@gmail.com: sympy imports matplotlib on
start-up
http://code.google.com/p/sympy/issues/detail?id=3427
In order to get an objective test, it is probably a good idea to look at
the import time after clearing the disk cache. Under Linux, this can be
done
Comment #13 on issue 3427 by hacm...@gmail.com: sympy imports matplotlib on
start-up
http://code.google.com/p/sympy/issues/detail?id=3427
I guess I'm suggesting that this may be a dupe of
https://code.google.com/p/sympy/issues/detail?id=1291
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Comment #14 on issue 3427 by asmeu...@gmail.com: sympy imports matplotlib
on start-up
http://code.google.com/p/sympy/issues/detail?id=3427
If you import SymPy in a clean environment (i.e., a virtualenv or something
similar), and compare it against your normal environment, you can see how
Issue 3427: sympy imports matplotlib on start-up
http://code.google.com/p/sympy/issues/detail?id=3427
This issue is now blocking issue sympy:1291.
See http://code.google.com/p/sympy/issues/detail?id=1291
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Updates:
Blockedon: sympy:3427
Comment #27 on issue 1291 by asmeu...@gmail.com: reduce the import sympy
time
http://code.google.com/p/sympy/issues/detail?id=1291
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Comment #16 on issue 3427 by asmeu...@gmail.com: sympy imports matplotlib
on start-up
http://code.google.com/p/sympy/issues/detail?id=3427
There's already some good discussion here, so I'll just mark this issue as
blocking that one.
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