I was hoping that someone could give me some help getting started with the
sympy tensor objects. I'd like to define symbolic objects to represent one-
and two-electron integrals in quantum chemistry with the proper index
permutation symmetries. These are real-valued integrals, so commutation
re
The following note appears in piecewise_fold and I can't see the reason for
not returning the expression that it tries to avoid. Can anyone enlighten
me?
# If expr is Boolean, we must return some kind of PiecewiseBoolean.
# This is constructed by means of Or, And and Not.
# piecewise_fold(0
This *might* work in the PR that I am struggling with that upgrades
Piecewise. #12587
On Thursday, April 27, 2017 at 11:41:47 PM UTC-5, chaowen guo wrote:
>
> Hi:
>
> import sympy
> x=sympy.symbols('x',real=True)
> sympy.integrate(sympy.Heaviside(x-1)*(x-1)+1,(x,0,2))
>
> the output is 2, which i
Given Eq(L, R) where L and R are the left and right hand sides of the
equation, try: `Eq(*list(reversed((L - R).expand().as_indepedent(foo,
as_Add=True` where foo is the variable of interest to get the new
equation.
On Tuesday, April 25, 2017 at 2:35:10 PM UTC-5, Jonathan Essen wrote:
>
> I
Pity, it is a very important PDE, it is the one-dimensional wave equation.
Nevertheless
many thanks.
Am Donnerstag, 4. Mai 2017 00:58:05 UTC+2 schrieb Aaron Meurer:
>
> You need to use u(x, t) everywhere. SymPy considers u(x) and u(x, t) to be
> completely different functions.
>
> Unfortunatel
Here's what I did: I copied what Brian G did in the
sympy.physics.secondquant module:
class TensorSymbol(sympy.Expr):
is_commutative=True
class SymmetricTensor(TensorSymbol):
def __new__(cls,symbol,inds1,inds2):
symbol = sympy.sympify(symbol)
inds1 = list(sympy.ordered(li
Hi everyone. As many of you may have noticed, Google has announced the
results
for Google Summer of Code. I am proud to announce that nine students have
been accepted to work on SymPy/SymEngine. The following projects have been
accepted:
Student (Project): Mentors
Abdullah Javed Nesar (Rubi Integ
Hello.
I play a little with Sympy Gamma and I think that it would be better to
not show sympy commands by default.
It should be better to decide to hide them and to have the possibility
to show sympy commands if we want it.
Just a suggestion. ;-)
--
Christophe BAL
Enseignant Agrégé de
I don't know if any code will break with it, but I think it's better for
Piecewise to only deal with expressions. For booleans, you can get the
equivalent of a Piecewise using logic classes like And, Or, Not, or even
more advanced things like ITE (ITE means "if-then-else"). Piecewise on
booleans is
the package is both for symbolic/numeric solver for SDE's and could run
within Jupyter notebook environment,
https://github.com/cchuang2009/PySDE
cch
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Congratulations everyone!
On May 5, 2017 12:31 AM, "Aaron Meurer" wrote:
> Hi everyone. As many of you may have noticed, Google has announced the
> results
> for Google Summer of Code. I am proud to announce that nine students have
> been accepted to work on SymPy/SymEngine. The following projec
Hi Rick,
On Thu, May 4, 2017 at 8:51 AM, Rick Muller wrote:
> I was hoping that someone could give me some help getting started with the
> sympy tensor objects. I'd like to define symbolic objects to represent one-
> and two-electron integrals in quantum chemistry with the proper index
> permutat
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