Re: [sympy] Sympy physics mechanics

2022-01-29 Thread Peter Stahlecker
Dear Jason, I think my code is short, but I will have to ask my son how to attach a file to gmail. Thanks, Peter On Sat 29. Jan 2022 at 17:09, Jason Moore wrote: > Peter, > > The ideal way to do this is to paste the code into the email or in a > Github discussion. Making the code as short as

Re: [sympy] Sympy physics mechanics

2022-01-29 Thread Jason Moore
Peter, The ideal way to do this is to paste the code into the email or in a Github discussion. Making the code 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

[sympy] Sympy physics mechanics. Degenerate mass matricx

2022-01-29 Thread Peter Stahlecker
Dear Jason, Attached a Jupiter note book, in case this is better for you. Thanks for any help! Peter -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to

Re: [sympy] Sympy physics mechanics

2022-01-29 Thread Peter Stahlecker
Dear Jason, I had to send it by separate mail, as I di not know how to attach a file to gmail. Thanks, Peter On Sat 29. Jan 2022 at 15:48, Jason Moore wrote: > Peter, > > You'll have to share your code for us to help, as this isn't enough > information. > > Jason > moorepants.info > +01

[sympy] Sympy physics mechanics. Singular mass matrix

2022-01-29 Thread Peter Stahlecker
Dear Jason, Attached, please find my code. Thanks for any help! Peter -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To view

Re: [sympy] Sympy physics mechanics

2022-01-29 Thread Jason Moore
Peter, You'll have to share your code for us to help, as this isn't enough information. Jason moorepants.info +01 530-601-9791 On Sat, Jan 29, 2022 at 9:50 AM Peter Stahlecker wrote: > I try to model a simple one mass point pendulum in 3D, the mass point is > located on the y - axis, at a

[sympy] Sympy physics mechanics

2022-01-29 Thread Peter Stahlecker
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