> Note that your benchmark is flawed since it creates an
AssumptionsWrapper each time in the timing loop. If we only want to
make a single call to is_positive then we could have a function that
does that without creating a new Basic instance. Otherwise the
AssumptionsWrapper is created so that
Aaron, Oscar, please share your idea on this. My recent opinion is:
1. We need relational predicates (Q.eq) to make inference system work with
relations. Eq(..., evaluate=False) cannot do this.
2. I will not replace Eq with Q.eq because doing that will break backwards
compatibility. Instead,
That's nice. Thanks for your effort!
2020년 11월 9일 월요일 오후 8시 58분 49초 UTC+9에 Oscar님이 작성:
> I'm almost ready with the release script. This is a busy time of the
> year for me at work so it's difficult to find time to work on sympy
> right now.
>
> Oscar
>
> On Mon, 9 Nov 2020 at 04:52, 송지수 / 학생 /
uffini_theorem>.
Converting to a matrix M to matrix of floats M.n() works as a workaround
since then the eigenvalues can be computed approximately by mpmath."?
and giving a link to this conversation?
On Thursday, May 14, 2020 at 2:47:41 PM UTC+2, JS wrote:
>
> Thank you.
> T
Thank you.
This has worked for all matrices that I have tried. : - )
Even M.is_positive_definite and M.is_negative_definite works.
On Thursday, May 14, 2020 at 1:54:52 PM UTC+2, Oscar wrote:
>
> Looking at it seems that the improvements were for `is_positive_definite`,
>
Hello,
I have run into a problem with various matrices. I have read Gotchas and
Pitfalls and tried to search around, but I was unable to find anything
relevant.
For some matrices M, the *M.is_indefinite* simply *returns no output*. I
have noticed that M.eigenvals() works for on these
Your suggestion is true. However, using ``Derivative(f(x), x) *
1/Derivative(x+1, x)`` explicitly every time is not very systematic
approach.
If we know "Hey, df(x)/d(x+1) equals (df(x)/dx)/(d(x+1)/dx)!", then why
don't we let SymPy know to automatically deal with this case with same
approach?
I have tried, and although it was working well, `diff()` method was
unaffected since `Expr.diff()` method is connected to `Derivative`.
2020년 1월 4일 토요일 오후 7시 8분 39초 UTC+9, Francesco Bonazzi 님의 말:
>
> It's suggest to subclass Derivative if this feature is needed.
--
You received this message
objects. Then sin(x) would create an object that represents
> calling the function sin with the argument x like Call(sin, x). Then
> undefined functions can be more like symbols.
>
> On Sun, 8 Dec 2019 at 03:36, JS S >
> wrote:
> >
> > Can you link me to
differentiate
> functions directly without needing any reference to an unnecessary
> symbol as in `D(sin) -> cos`. In the context of multivariable
> functions and partial differentiation maybe that would be something
> like `D[2](atan2)`...
>
> --
> Oscar
>
> On
In the top docstring of core/function, such behavior is proposed.
I also found it mentioned in https://github.com/sympy/sympy/issues/5105,
which was open 10 years ago...
I know that using `rcall` on `Lambda(x,sin(x))+Lambda(x,cos(x))` will do
it, but it seems a bit verbose.
I am currently
, Francesco Bonazzi 님의 말:
>
>
>
> On Monday, 2 December 2019 05:25:54 UTC+1, JS S wrote:
>>
>>
>> Likewise, there exists no class such as 'NDimArrayAdd' class, making
>> NDimArray subclass of Basic only.
>>
>
> Technically there is *CodegenArrayElementw
c 2019 at 01:59, JS S >
> wrote:
> >
> > But what confuses me is this:
> >
> > - ImmutableDenseMatrix is subclass of Expr
> > - ImmutableSparseMatrix is subclass of Basic, but not Expr.
> > - ImmutableDenseNDimArray is, unlike its Matrix counterpart, subcl
Sorry for duplicate question - my previous one didn't get any answer so I
cannot but ask again.
Now, I know that Basic object must be immutable, and Expr object must be
able to be subject to arithmetic operation.
(As far as I know, that is why some classes, e.g. FiniteSet, is instance of
y. I'm not sure about Vector but I think it is
> similar.
>
> Aaron Meurer
>
> On Fri, Nov 29, 2019 at 12:23 AM JS S >
> wrote:
> >
> > I'm just being curious.
> > Some classes in sympy, such as Matrix in matrices package or Vector i
I'm just being curious.
Some classes in sympy, such as Matrix in matrices package or Vector in
physics.vector package, are not subclass of Basic.
Is this intentional?
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