Re: [sympy] physics/mechanics questions

2016-06-02 Thread James Milam
"Lagrange's method produces a kinematical equation (linear in q'), a dynamical equation (linear in q''), and a constraint equation that includes Langrange multipliers (if there are constraints). The m_c, m_dc, and m_d are simply the matrices that contain the coefficients to the linear terms in

Re: [sympy] physics/mechanics questions

2016-05-31 Thread Jason Moore
Correction on what Kane's method class produces, in order as presented in the docs: 1. holonomic constraint equation (non-linear in the coordinates, e.g. kinematic loop constraints) [ this can also be in Langrange's method as a 4th equation but we currently don't have it explicitly defined] 2. non

Re: [sympy] physics/mechanics questions

2016-05-31 Thread Jason Moore
These descriptions reflect the differences in what Langrange's and Kane's method produces. Lagrange's method produces a kinematical equation (linear in q'), a dynamical equation (linear in q''), and a constraint equation that includes Langrange multipliers (if there are constraints). The m_c, m_dc

[sympy] physics/mechanics questions

2016-05-31 Thread James Milam
These statements are found in the Kane's method and Lagrange's method docs and are seemingly contradictory "In mechanics we are assuming there are 5 basic sets of equations needed to describe a system." "In mechanics we are assuming there are 3 basic sets of equations needed to describe a syste