A very graceful eulogy.
Best regards,
Peter Stahlecker
On Mon 11. Mar 2024 at 20:03, Aaron Meurer wrote:
> The passing of Kalevi Suominen truly a loss for the SymPy community.
>
> I had the honor of meeting Kalevi face to face once on a video call
> many years ago, but other tha
This looks VERY interesting!
Is it also available for iPhone / iPad?
Thanks!
cing...@gmail.com schrieb am Montag, 12. Februar 2024 um 00:29:26 UTC+1:
> Hey, Sympy group,
> Math solver that using Sympy now updated and added step-by-step solution
> via Sympy Gamma.
>
>
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t;
>
> On Thu, May 11, 2023 at 11:58 AM Peter Stahlecker <
> peter.stahlec...@gmail.com> wrote:
>
>> Thanks! I installed, all works fine.
>> An impressive list of contributors!!
>> A shame, I am likely too old (and probably not smart enough)to be one,
>>
249cd14c5bc2ad20ce8d5fd4884bc51062bc0eddb79537e0996b05befe1097
> sympy-docs-html-1.12.zip
> 34455a55aece7dc38a090728b500e5f6bdebe588be93ed6fbc3262694d681ed6
> sympy-docs-pdf-1.12.pdf
>
> --
> Oscar
>
> --
> You received this message because you are subscribed to the Google
(x)
>
> res will then be just x.
>
> That's not the syntax though, I don't know it off the top of my head.
>
> moorepants.info
> +01 530-601-9791
>
>
> On Wed, Mar 29, 2023 at 11:10 AM Peter Stahlecker <
> peter.stahlec...@gmail.com> wrote:
>
>> Dear Jaso
t; moorepants.info
> +01 530-601-9791
>
>
> On Wed, Mar 29, 2023 at 10:03 AM Peter Stahlecker <
> peter.stahlec...@gmail.com> wrote:
>
>> Dear Tilo,
>>
>> I am just a (semi retired) recreational user of sympy, mostly
>> sympy.physics.mechanics. I have no ambit
t;> >
>>> > I would appreciate your opinion on which of these ideas to explore
>>> further, and whether there are any better-suited to my background.
>>> >
>>> > --
>>> > You received this message because you are subscribed to the Goog
Thank you VERY much for this clear and detailed explanation!
This really helped me to understand the issue of deprecation.
Peter
Am So., 15. Jan. 2023 um 23:09 Uhr schrieb Oscar Benjamin <
oscar.j.benja...@gmail.com>:
> On Sun, 15 Jan 2023 at 16:12, Peter Stahlecker
> wrote:
unsubscribe from this group and stop receiving emails from it, send an
> email to sympy+unsubscr...@googlegroups.com.
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> .
>
--
it.
>
>
>
> Thanks for the tip. Here are the docs for solveset: Solveset - SymPy 1.11
> documentation
> <https://docs.sympy.org/latest/modules/solvers/solveset.html>. Sadly, I
> think it can only solve for one variable.
>
>
>
>- Carl
>
>
>
> *Fro
bscr...@googlegroups.com.
> To view this discussion on the web visit
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Pete
2022 at 4:04:20 AM UTC-6 Oscar wrote:
>>
>>> The ordinary Python round function can do this:
>>> https://docs.python.org/3/library/functions.html#round
>>>
>>>
>>> On Thu, 17 Nov 2022 at 09:46, Peter Stahlecker
>>> wrote:
>>>
you might want to check floating point numbers in the sympy documentation.
Am Do., 17. Nov. 2022 um 10:18 Uhr schrieb 'XR-7 RKE' via sympy <
sympy@googlegroups.com>:
> Hey guys,
>
> Does sympy support round a number to significant figures?
>
> [image: SCR-20221117-m64.png]
>
> --
> You received
ps.com?utm_medium=email_source=footer>
>>>>> .
>>>>>
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termx_w_solvent2
>>>>>
>>>>> Zohreh Karimzadeh
>>>>> *https://www.researchgate.net/profile/Zohreh-Karimzadeh*
>>>>> <https://www.researchgate.net/profile/Zohreh-Karimzadeh>
>>>>> Skype Name 49a52224a8b6b38b
>>>
.13 sec with cse=True, 65
times faster!
Thanks! Peter
On Wed 24. Aug 2022 at 14:48 Peter Stahlecker
wrote:
> Dear Oscar,
>
> my expressions into lambdify are of sm.Matrix type.
> With cse=False, the output of lambdify is a numpy.ndarray of the same
> shape as the sm.Matri
the lists into ndarrays of
the correct shape, the code should run with cse=True, too?
Thanks, Peter
On Wed 24. Aug 2022 at 14:26 Oscar Benjamin
wrote:
> On Wed, 24 Aug 2022 at 08:55, Peter Stahlecker
> wrote:
> >
> > I have upgraded to sympy 1.11
> > I wanted to try the cse k
s-pdf-1.11.pdf
>
> --
> Oscar
>
> --
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> To
102116325
> Value Water)))
>
>
> On Mon, Aug 22, 2022 at 7:42 PM Oscar Benjamin
> wrote:
>
>> On Mon, 22 Aug 2022 at 15:36, Peter Stahlecker
>> wrote:
>> >
>> > Dear Oscar,
>> >
>> > Thanks for your hint
m this group and stop receiving emails from it, send an
> email to sympy+unsubscr...@googlegroups.com.
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> <https://groups.google.com/d/msgi
+989102116325
> and at
> z.karimza...@gmail.com
> ️
>
>
> On Sat, 20 Aug 2022, 11:32 Peter Stahlecker,
> wrote:
>
>> args is a standard key word with minimize, just look it up to see how it
>> works.
>>
uld make independent variables acceptable as args to
> minimizer,?
>
>
> Zohreh Karimzadeh
>
> Contact me on
>+989102116325
> and at
> z.karimza...@gmail.com
> ️
>
>
> On Sat, 20
>
>
> On Sat, 20 Aug 2022, 06:15 Peter Stahlecker,
> wrote:
>
>> Maybe a dumb question from my part:
>>
>> do I understand you correctly:
>>
>> For *given* L, K, VA you try to find the alpha, beta, gamma, eta which
>> minimize
>> the function
t;> File
>>> "C:\Users\Zohreh\AppData\Roaming\Python\Python310\site-packages\sympy\core\cache.py",
>>> line 74, in wrapper
>>> retval = func(*args, **kwargs)
>>> File
>>> "C:\Users\Zohreh\AppData\Roaming\Python\Python310\site-packages\
/Zohreh-Karimzadeh*
> <https://www.researchgate.net/profile/Zohreh-Karimzadeh>
> Skype Name 49a52224a8b6b38b
> Twitter Account @zohrehkarimzad1
> z.karimza...@gmail.com
> +989102116325
> Value Water)))
>
>
> On Thu, Aug 18, 2022 at 4:49 PM Pet
hreh-Karimzadeh>
> Skype Name 49a52224a8b6b38b
> Twitter Account @zohrehkarimzad1
> z.karimza...@gmail.com
> +989102116325
> Value Water)))
>
>
> On Thu, Aug 18, 2022 at 4:35 PM Peter Stahlecker <
> peter.stahlec...@gmail.com> wrote:
&
> z.karimza...@gmail.com
> +989102116325
> Value Water)))
>
>
> On Thu, Aug 18, 2022 at 4:08 PM Peter Stahlecker <
> peter.stahlec...@gmail.com> wrote:
>
>> I just have no idea what
>>
>> np.sum((np.log(AV) + Vlam_est)**2)
>&g
102116325
> Value Water)))
>
>
> On Thu, Aug 18, 2022 at 3:28 PM Peter Stahlecker <
> peter.stahlec...@gmail.com> wrote:
>
>> In your first return statement, where it works, you seem to return a
>> number.
>> In your second re
l.py",
> line 718, in eval
> coeff = arg.as_coefficient(I)
> AttributeError: 'ImmutableDenseNDimArray' object has no attribute
> 'as_coefficient'
>
>
>
>
>
>
>
>
> Zohreh Karimzadeh
> https://www.researchgate.net/profile/Zohreh-Karimzadeh
> Skype Name 4
Import numpy as np
and the write np.sqrt, or sp.sqrt, whichever you want in the context.
Then it is clear, which sqrt is meant.
On Thu 18. Aug 2022 at 13:12 Peter Stahlecker
wrote:
> I use lambdify quite a bit, on rather large expressions.
> Basically, it always works like this for me:
>
log(Y) - Y_est)**2)
>>>
>>>
>>> bnds = [(1, np.inf), (0, 1), (0, 1), (-1, np.inf)]
>>> x0 = (1, 0.01, 0.98, 1)
>>> con = {"type": "eq", "fun": c}
>>>
>>> result = minimize(f, x0, bounds=bnds)
>>>
>
google.com/d/msgid/sympy/1f0b313f-31c5-402e-991e-142a556016f4n%40googlegroups.com
> <https://groups.google.com/d/msgid/sympy/1f0b313f-31c5-402e-991e-142a556016f4n%40googlegroups.com?utm_medium=email_source=footer>
> .
>
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Peter Stahlecker
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have to set max_step = 0.01 to get a constant total energy. If I do not
do this, it is not constant.
Peter
On Sat 25. Jun 2022 at 18:15 Peter Stahlecker
wrote:
> Dear Jason,
>
> Thanks a lot!
> It seems to be my program, rather than *kinetic energy*.
>
> The sample which d
lpful so we can find and fix the bug.
>
> Jason
> moorepants.info
> +01 530-601-9791
>
>
> On Thu, Jun 23, 2022 at 1:44 PM Peter Stahlecker <
> peter.stahlec...@gmail.com> wrote:
>
>> I = me.inertia(A, iXX….) gives the inertia in the (normally) body -
>> fixed frame
I = me.inertia(A, iXX….) gives the inertia in the (normally) body - fixed
frame A
Body = Me.RigidBody( ‚Body‘, mass center, frame, mass, ( I, P))
My question: Does RigidBody ‚assume‘, that mass center = P ?
Reason behind my question:
For regular homogenious bodies, iXX, IYY, etc are often
iving emails from it, send an
> email to sympy+unsubscr...@googlegroups.com.
> To view this discussion on the web visit
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> <https://groups.google.com/d/msgid/sympy/CAKgW%3D6J6
>> P2.set_ang_vel(P1, omega*1* * P1.z)
>>
>> It should probably be
>>
>> P2.set_ang_vel(P1, omega*2* * P1.z)
>>
>> With this change, it would calculate some rhs, like:
>>
>> rhs = kanes.rhs()
>>
>> Peter
>>
>&
version of sympy or python which is causing the
>>>> issue. If I try to perform the same method on the human standing tutorial
>>>> I get the same error but for the bodies being RigidBody instead of
>>>> Particle. I've run this tutorial and numerous other exampl
ticle. I've run this tutorial and numerous other examples in the past
>>> without this error occurring.
>>>
>>> Is there a known workaround to this issue?
>>>
>>> Thanks,
>>> Nick
>>>
>>> --
>>> You received this
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> .
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Best regards,
Peter Stahlecker
--
You received this message because you are subscribed to the
e a valid question though, but thought I should try to ask
>>>> first.]*
>>>>
>>>
>>>> --
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>>> Groups "sympy" group.
>>> To unsubscribe from
I have never used sympy statistics, hence my comments may be without any
use.
1.
With matplotlib there is an excellent visualisation library available.
Hard for me to see, how you can beat it.
2.
There is a library sdeint available, which numerically integrates Ito or
Stratchonovich stochastic
;> .
>>
>> --
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force that we could encode or
> even a simple spring (or a complex nonlinear spring).
>
> Jason
> moorepants.info
> +01 530-601-9791
>
>
> On Fri, Mar 25, 2022 at 9:59 AM Peter Stahlecker <
> peter.stahlec...@gmail.com> wrote:
>
>> Stupid questio
ribed to the Google Groups
> "sympy" group.
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I managed to get it.
Thanks a lot for your help!!
On Mon 21. Mar 2022 at 13:07, Peter Stahlecker
wrote:
> Dear Liu,
>
> Thanks for your prompt reply!
> I tried as you suggested, where speedx is the expression, whose numerator
> and denominator I want to get.
> I got the erro
s discussion on the web visit
> https://groups.google.com/d/msgid/sympy/78730755-ed5c-4490-b4d2-1aa5d72e84f0n%40googlegroups.com
> <https://groups.google.com/d/msgid/sympy/78730755-ed5c-4490-b4d2-1aa5d72e84f0n%40googlegroups.com?utm_medium=email_source=footer>
> .
>
--
Best re
I get an expression in sympy which looks like f(x) / g(x) when I print it.
Is there any way to get f(x) and g(x) explicitly?
Thanks for any help!
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would
be excellent!
Thanks,
Peter
Am Do., 17. März 2022 um 01:54 Uhr schrieb Oscar Benjamin <
oscar.j.benja...@gmail.com>:
> On Wed, 16 Mar 2022 at 23:33, Peter Stahlecker
> wrote:
> >
> > Dear Oscar,
>
> Hi Peter!
>
> > Just for my understanding:
>
om this group and stop receiving emails from it, send an
> email to sympy+unsubscr...@googlegroups.com.
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> .
>
--
Best regards,
P
I found my mistake, matter closed.
Am Mo., 7. März 2022 um 13:22 Uhr schrieb Peter Stahlecker <
peter.stahlec...@gmail.com>:
> I tried on a 'small' example, and N_y.suns({sm.Derivative(q1, t): u1})
> worked just fine !!
> No idea, what is going on.
>
> Am So., 6. März 2022
I tried on a 'small' example, and N_y.suns({sm.Derivative(q1, t): u1})
worked just fine !!
No idea, what is going on.
Am So., 6. März 2022 um 15:18 Uhr schrieb Peter Stahlecker <
peter.stahlec...@gmail.com>:
> I am playing around with an ellipse, which rotates in 3D.
> In its ow
I am playing around with an ellipse, which rotates in 3D.
In its own coordinate system A, its equation of course is
x**2/a**2 + y**2/b**2 + z**2/c**2 = 1
A rotates relative to N, the generalized coordinates are q1, q2, q3,
dq1/dt = u1, etc.
I express the rotated ellipse in N, by using
k/10.1007/0-306-47122-1
> On 2/14/22 12:40 PM, Peter Stahlecker wrote:
>
> Dear Jason,
>
> As to the speed of the new terms, I simply tried it, using the equations
> of motion of a one body pendulum.
> There is no difference to the older terms:
>
> with the *body* v
operations.
The operations count was *exactly* the same with older and newer terms.
Take care, Peter
On Mon 14. Feb 2022 at 18:04 Peter Stahlecker
wrote:
> Dear Jason,
>
> Just read you latest addition about vectors and reference frames.
> Small question:
> In order to rotate a
eter
On Sun 6. Feb 2022 at 08:19 Peter Stahlecker
wrote:
> Dear Jason,
>
> Thanks a lot for your explanation! Clear!
> I checked on metaclasses, but I must admit I mostly understood, that a
> simple user like me should not mess with them! :-))
>
> Peter
>
> On Sun 6. Feb 2
is/continuum mechanics idea.
>>
>> On Tue, Feb 1, 2022 at 4:09 PM Peter Stahlecker
>> wrote:
>>
>>> I wonder what kind of answer you expect from sympy group.
>>> If you look at the documentation, you can see what is available.
>>>
>>> Am
th in
> the last line. It is just the way SymPy Function works. There are open
> issues about trying to change it to something more sensible for the user to
> understand.
>
> Jason
> moorepants.info
> +01 530-601-9791
>
>
> On Sun, Feb 6, 2022 at 7:39 AM Peter Stahlecker
My question is more for my ‚general education‘ in sympy.
I write this little program
*from sympy.physics.mechanics import **
*import sympy as sm*
*a = dynamicsymbols(‚a‘)*
*b = sm.symbols(‚b‘)*
*print(‚type of a:‘, type(a))*
*print(‚type of b:‘, type(b))*
I get this result:
*type of a: a*
9791
>
>
> On Thu, Feb 3, 2022 at 10:37 AM Peter Stahlecker <
> peter.stahlec...@gmail.com> wrote:
>
>> Dear Jason,
>>
>> Thanks!
>> If I understood correctly, if I use velocity constraints, I do not use
>> the minimal number of generalized coordina
us some equations that can be solved for the
> forces.
>
> Jason
> moorepants.info
> +01 530-601-9791 <(530)%20601-9791>
>
>
> On Thu, Feb 3, 2022 at 10:03 AM Peter Stahlecker
> wrote:
>
>> Thanks! Would I also set the 'reaction forces' appearing in the force
&g
eds will appear in the force equations, but you then just
> set them to zero because they are fictitious. You force equation should
> then be correct.
>
> Jason
> moorepants.info
> +01 530-601-9791 <(530)%20601-9791>
>
>
> On Thu, Feb 3, 2022 at 9:58 AM Peter S
When I use a velocity constraint to force a particle not to move in a
certain direction, there must be a 'reaction force' on the particle.
I use KM.auxiliary_eqs to find reaction forces, which works very well in
general!
However, if I try to find the reaction force due to a velocity
P%3DLymdT-ebAW4dPh8u0cBXaLQ7D9Jn9Cm3-U5dQ%40mail.gmail.com?utm_medium=email_source=footer>
> .
>
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For what it is worth:
With *KM.auxiliary_eqs*
one gets the forces acting on, say, the point where some multi body system
is attached to.
I tried to see, if one could also get the forces needed to make a particle
move in on predetermined path.
In the simple example attached (where the result is
I wonder what kind of answer you expect from sympy group.
If you look at the documentation, you can see what is available.
Am Mo., 31. Jan. 2022 um 17:38 Uhr schrieb Yashvardhan Prasad <
yash1...@gmail.com>:
> Hello everyone,
> I am Yashvardhan Prasad, a 2nd year undergraduate student. I wish to
ode as short as possible to demonstrate the
> issues is also helpful.
>
> Here is a good example: https://github.com/sympy/sympy/discussions/22848
>
> Jason
> moorepants.info
> +01 530-601-9791
>
>
> On Sat, Jan 29, 2022 at 11:07 AM Peter Stahlecker <
> peter.stahle
Dear Jason,
Attached a Jupiter note book, in case this is better for you.
Thanks for any help!
Peter
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> On Sat, Jan 29, 2022 at 9:50 AM Peter Stahlecker <
> peter.stahlec...@gmail.com> wrote:
>
>> I try to model a simple one mass point pendulum in 3D, the mass point is
>> located on the y - axis, at a distance d. Rotations arou
Dear Jason,
Attached, please find my code.
Thanks for any help!
Peter
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To view
I try to model a simple one mass point pendulum in 3D, the mass point is
located on the y - axis, at a distance d. Rotations around the y-axis do
not make physical sense, hence, I use only qx, qz to describe the angles of
rotation of the frame of m.
If MM is the mass matrix, I get
Meurer
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I was playing around with a simple 2D pedulum consisting of 4 bodies.
I included one non-holonomic constraint on one of the rotational speeds.
I also wanted to calculate the forces acting on the support of the
pendulum, using
KM.auxiliary_eqs.
Now the ‚virtual speeds‘ needed to calculate the
Forget my question above: I DID make a stupid mistake!
All works fine!
Peter Stahlecker schrieb am Dienstag, 11. Januar 2022 um 16:11:04 UTC+1:
> I calculated a very simple pendulum system, using one non - holonomic
> constraint. All worked as per expectation. Then I tried to cal
> various routines but it makes me wonder if you showed the right
> matrix.
>
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> Oscar
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I calculated a very simple pendulum system, using one non - holonomic
constraint. All worked as per expectation. Then I tried to calculate the
reactive forces at the point of attachment, using KM.auxiliary_eqs. (KM
being the Kanes object).
I replaced the accelerations of the generalised
Hi,
I cannot see any use for me personally, but I think it is a great strength
of python / sympy that such packages are available.
Am Do., 18. Nov. 2021 um 22:28 Uhr schrieb Zoufiné Lauer-Baré <
zoufine.b...@gmail.com>:
>
> Dear SymPy Community,
>
> the IexFinder: Interactive Symbolic
Your explanation makes eminent sense!
I did not think of this at all: surely a term 1^oo does not drop out of the
sky, it has a ‚history‘.
Thanks!
On Sun 7. Nov 2021 at 02:44 Oscar Benjamin
wrote:
> On Sat, 6 Nov 2021 at 16:55, Peter Stahlecker
> wrote:
> >
> > I am just a h
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> .
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Best regards,
Peter Stahlecker
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There is a Python App for iPad, called JUNO.
To the best of my knowledge, it uses Python 3.6.
This might be a small reason to extend compatibility to this version.
Am Di., 17. Aug. 2021 um 12:12 Uhr schrieb Oscar Benjamin <
oscar.j.benja...@gmail.com>:
> Hi all,
>
> This issue discusses SymPy's
instructions on reproducing this and we can look into it.
>
> Jason
> moorepants.info
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>
> On Tue, Jun 29, 2021 at 2:45 PM Peter Stahlecker <
> peter.stahlec...@gmail.com> wrote:
>
>> Dear Jason,
>>
>> Maybe it is not 'Body' vs. 'Ax
not sure why the body
> fixed rotations are so much worse.
>
> Jason
> moorepants.info
> +01 530-601-9791
>
>
> On Tue, Jun 29, 2021 at 1:00 PM Peter Stahlecker <
> peter.stahlec...@gmail.com> wrote:
>
>> Dear Jason,
>>
>> Thanks!
>> I
rix numerically
> etc. A 3D rotation can be computed very cheaply in floating point with
> quaternions.
>
> --
> Oscar
>
> On Tue, 29 Jun 2021 at 12:00, Peter Stahlecker
> wrote:
> >
> > Dear Jason,
> >
> > Thanks!
> > I tested it right away, and I
moorepants.info
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> On Tue, Jun 29, 2021 at 5:09 AM Peter Stahlecker <
> peter.stahlec...@gmail.com> wrote:
>
>> When I want to do this, it seems to me there are these possibilities:
>>
>> 1.
>> A = N.orientnew(‚A‘, ‚Body‘, [q1, q2
When I want to do this, it seems to me there are these possibilities:
1.
A = N.orientnew(‚A‘, ‚Body‘, [q1, q2, q3], ‚123‘)
This does it in one step
2.
I use two intermediate frames and use the word ‚Axis‘ instead of ‚Body‘
Geometrically, this should be the same, but it seems to me, that with
the same result.
>
> Jason
> moorepants.info
> +01 530-601-9791
>
>
> On Sat, Jun 19, 2021 at 9:33 AM Peter Stahlecker <
> peter.stahlec...@gmail.com> wrote:
>
>> I am playing around with this feature to get the forces acting on some
>> point.
>>
I am playing around with this feature to get the forces acting on some
point.
The result of KM.auxiliary_eqs contains (also) generalized accelerations.
I replace them with the relevant entries of KM.rhs().
This seems to work, but it gives BIG equations for even small problems.
Is this the correct
t; then you can solve for the complete motion. The coordinates associated with
> those equations are ignorable (from the dynamics perspective).
>
> Jason
> moorepants.info
> +01 530-601-9791
>
>
> On Wed, Jun 16, 2021 at 11:52 AM Peter Stahlecker <
> peter.stahle
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