Am 30.03.2015 um 21:33 schrieb Aaron Meurer:
I would definitely test the different alternatives for sympy.abc to
see what's faster.
I just ran bin/test with `a = Symbol('a')` etc.
Runtime went from 56:29 to 56:37, i.e. below the noise threshold.
That was with Python 2.7. I guess the Pyton
In [1]: var('x y', positive=True)
Out[1]: (x, y)
In [2]: ex = x**2 * y**4
In [3]: w = Wild('w')
In [4]: mt = ex.match(w**2)
In [5]: mt
Out[5]:
⎧ 2⎫
⎨w: x⋅y ⎬
⎩ ⎭
In [6]: Pow(mt[w], 2, evaluate=False)
Out[6]:
2
⎛ 2⎞
⎝x⋅y ⎠
On Tuesday, March 31, 2015 at 4:50:59 PM
On Wednesday, April 1, 2015 at 11:35:40 PM UTC+2, Christophe Bal wrote:
I'm learning git [ ... ]
I suggest to use PyCharm, it's an excellent Python development environment,
plus it has a very comfortable integration with github:
In [1]: ex = sqrt(x+1)+x+3
In [2]: ex.subs(x, solve(y-sqrt(x+1), x)[0])
Out[2]:
2 ╱ 2
y + ╲╱ y + 2
If *y* is declared to be positive, you get the right expression.
On Wednesday, April 1, 2015 at 7:01:29 PM UTC+2, Paul Royik wrote:
Is there a function that
Thanks for the answers.
Indeed I was hoping that git can manage multi pull requests. If it is not
case, Il will build a python scripts such to play with the git --stat
outputs.
Now that I know a little git, I will try to participate as soon as possible.
Thanks for pycharm but I prefer to use
It looks like the root cause of this is that the Function doesn't have all
the assumptions set. I don't fully understand how assumptions are wired
in, and I know the assumptions system is in flux, but it looks like None is
a flag for exists but not set. Would it be better to have FactKB
Hi,
This seems interesting and might be a bug. Could you please create an issue
here https://github.com/sympy/sympy/issues with your *equations* and
traceback.
Sudhanshu Mishra
On Fri, Apr 3, 2015 at 3:07 AM, G B g.c.b.at.w...@gmail.com wrote:
It looks like the root cause of this is that the
Is there any way subs can substitute 3x+3y into 3t without factoring first?
I enter 3*(x+y) but sympy automatically converts it into 3x+3y and subs
doesn't work.
On Thursday, April 2, 2015 at 12:15:02 PM UTC+3, Francesco Bonazzi wrote:
In [1]: ex = sqrt(x+1)+x+3
In [2]: ex.subs(x,
Maybe you should read the documentation. Have a look at unevaluated expressions.
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To
I guess we need a reverse of powdenest (like powcollect or something).
Aaron Meurer
On Tue, Mar 31, 2015 at 9:50 AM, Paul Royik distantjob...@gmail.com wrote:
Is there any way I can rewrite
x^2y^4 to (xy^2)^2 or x^3(x+y)^6 to (x(x+y)^2)^3
, i.e. combine base?
Exponents are guaranteed to
Your aaproach fails when we want to substitute sqrt(xy+1) for u.
What to solve here?
On Thursday, April 2, 2015 at 4:17:54 PM UTC+3, Paul Royik wrote:
Another smart solution. Thanks a ton.
Maybe you can tell me why the following code doesn't work:
https://github.com/sympy/sympy/issues/9233
You can also add something to your ./git/config to always fetch these
https://gist.github.com/piscisaureus/3342247
I recommend using the hub command for better integration with git and github.
Aaron Meurer
On Thu, Apr 2, 2015 at 10:19 AM, Ondřej Čertík ondrej.cer...@gmail.com wrote:
Hi
Hi Christophe,
On Thu, Apr 2, 2015 at 8:38 AM, Joachim Durchholz j...@durchholz.org wrote:
Am 02.04.2015 um 11:30 schrieb Christophe Bal:
Thanks for the answers.
Indeed I was hoping that git can manage multi pull requests. If it is not
case, Il will build a python scripts such to play with
Another smart solution. Thanks a ton.
Maybe you can tell me why the following code doesn't
work: https://github.com/sympy/sympy/issues/9233
On Thursday, April 2, 2015 at 12:15:02 PM UTC+3, Francesco Bonazzi wrote:
In [1]: ex = sqrt(x+1)+x+3
In [2]: ex.subs(x, solve(y-sqrt(x+1), x)[0])
Smart solution. Thank you.
On Thursday, April 2, 2015 at 12:10:38 PM UTC+3, Francesco Bonazzi wrote:
In [1]: var('x y', positive=True)
Out[1]: (x, y)
In [2]: ex = x**2 * y**4
In [3]: w = Wild('w')
In [4]: mt = ex.match(w**2)
In [5]: mt
Out[5]:
⎧ 2⎫
⎨w: x⋅y ⎬
⎩ ⎭
In
Am 02.04.2015 um 11:30 schrieb Christophe Bal:
Thanks for the answers.
Indeed I was hoping that git can manage multi pull requests. If it is not
case, Il will build a python scripts such to play with the git --stat
outputs.
Wait until you have seen some actual merge conflicts :-)
It's not
Symbols are cached by name and assumptions, and like everything else in
SymPy, are immutable. Thus:
In [1]: a = symbols('a')
In [2]: a2 = symbols('a', positive=True)
In [3]: a is a2
Out[3]: False
In [4]: hash(a) == hash(a2)
Out[4]: False
So no, you should have no problems with assumptions.
Performance:
Using symbols() in all contexts might have performance ramifications,
creating new Symbol() objects means more memory pressure than reusing
precreated symbols from sympy.abc (which happen 521 times in SymPy
itself, hopefully just in test code).
We cache symbol creation,
Am 02.04.2015 um 18:46 schrieb James Crist:
Performance:
Using symbols() in all contexts might have performance ramifications,
creating new Symbol() objects means more memory pressure than reusing
precreated symbols from sympy.abc (which happen 521 times in SymPy
itself, hopefully just in
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