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 <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 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 determinant(M) = 0. > As this pendulum is so simple, I do not think I made a mistake modeling it. > What could be the problem? > > Thanks for any help! > > -- > 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 this discussion on the web visit > https://groups.google.com/d/msgid/sympy/44eb551f-453a-47a6-ba23-335b32fd15e9n%40googlegroups.com > <https://groups.google.com/d/msgid/sympy/44eb551f-453a-47a6-ba23-335b32fd15e9n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- 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 this discussion on the web visit https://groups.google.com/d/msgid/sympy/CAP7f1AhLe%2Bz2%3DH-0oEt%3DOeKYrjf%2B4LWN_zArxPc1sF2yu7jypg%40mail.gmail.com.
