Comment #14 on issue 1026 by vlada.pe...@gmail.com: pypy doesn't run sympy
http://code.google.com/p/sympy/issues/detail?id=1026
I've applied Ronan's patch enabling pytest on top of your patch (and pushed
to [1]) and run py.test on the files you had errors in (as a rule they're
more informati
Comment #19 on issue 1816 by Vinzent.Steinberg: Adding partial derivatives
and taking derivatives with respect to functions
http://code.google.com/p/sympy/issues/detail?id=1816
In variational calculus, the first derivative of a functional is not that
complicated. Acutally, it's definition i
Status: New
Owner:
Labels: Type-Defect Priority-High
New issue 2552 by matt...@gmail.com: (1/(x*y)).subs(x*y, whatever) doesn't
work
http://code.google.com/p/sympy/issues/detail?id=2552
In [1]: (1/(x*y)).subs(x*y, 2)
Out[1]:
1
───
x⋅y
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Updates:
Status: Accepted
Comment #1 on issue 2552 by asmeurer: (1/(x*y)).subs(x*y, whatever) doesn't
work
http://code.google.com/p/sympy/issues/detail?id=2552
This is why:
In [15]: a = 1/(x*y)
In [16]: a.args
Out[16]:
⎛1 1⎞
⎜─, ─⎟
⎝x y⎠
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Comment #2 on issue 2552 by asmeurer: (1/(x*y)).subs(x*y, whatever) doesn't
work
http://code.google.com/p/sympy/issues/detail?id=2552
This also doesn't work:
In [21]: x, y = symbols('x y', positive=True)
In [22]: sqrt(x*y)
Out[22]:
⎽⎽⎽ ⎽⎽⎽
╲╱ x ⋅╲╱ y
In [23]: sqrt(x*y).subs(x*y, 2)
Out
Updates:
Cc: smi...@gmail.com
Comment #3 on issue 2552 by asmeurer: (1/(x*y)).subs(x*y, whatever) doesn't
work
http://code.google.com/p/sympy/issues/detail?id=2552
This is nontrivial to fix, btw, because Pow(a, e)*Pow(b, e) != Pow(a*b, e)
in general (that's why I had to set x and y
Updates:
Status: Fixed
Comment #2 on issue 2549 by smi...@gmail.com: as_independent gives
incorrect output for some functions of non commutative symbols
http://code.google.com/p/sympy/issues/detail?id=2549
(No comment was entered for this change.)
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Comment #4 on issue 2552 by smi...@gmail.com: (1/(x*y)).subs(x*y, whatever)
doesn't work
http://code.google.com/p/sympy/issues/detail?id=2552
A step forward on this might be to change as_base_exp so that a Mul of
bases to the same Integer exponent (which automatically gets separated at
in
Comment #5 on issue 2552 by smi...@gmail.com: (1/(x*y)).subs(x*y, whatever)
doesn't work
http://code.google.com/p/sympy/issues/detail?id=2552
(And the OP example failed before the modifications I made, too, so it's
not something that was untested but working previously.)
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Comment #6 on issue 2552 by asmeurer: (1/(x*y)).subs(x*y, whatever) doesn't
work
http://code.google.com/p/sympy/issues/detail?id=2552
...but that is a case where I really don't like the automatic algebraic
logic of the current subs anyway as I've noted in other issues.
Well, that's why it
Updates:
Blockedon: 2026
Comment #19 on issue 2081 by asmeurer: Pow substitution introduces wrong
answers
http://code.google.com/p/sympy/issues/detail?id=2081
(No comment was entered for this change.)
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"symp
Issue 2026: Exact, algebraic, and integer_power substitution
http://code.google.com/p/sympy/issues/detail?id=2026
This issue is now blocking issue 2081.
See http://code.google.com/p/sympy/issues/detail?id=2081
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