Hey Erik, perhaps the following c++ code may help you: State s=this->model.initSystem(); Storage statesStore; statesStore.setDescription("initial pose sequence"); Array<std::string> stateNames; stateNames=this->model.getStateVariableNames(); stateNames.insert(0, "time"); statesStore.setColumnLabels(...

Hello, I am a researcher in the field of engineering design. My knowledge on multi body dynamics is limited to what is taught in undergraduate lectures. I am using Opensim for virtual ergonomic testing (user-product interaction) which is done employing optimal control. In this context I am intereste...

Thank you very much, Sherm!
Complex values really make sense...
Regards,
Daniel

Hi Sherm, thanks for your reply. Here is my code: Matrix H; //matrix of elt <double> //..init matrix H to something Vector d; //also double Matrix V; //also double Eigen e(H); e.getAllEigenValuesAndVectors(d,V); //compute Eigenvalues and -vectors When I try to link this code the following error appe...

Hello, i have the following problem: within an OpenSim API programm I need to make use of some SimTK linear algebra functions. more precisely I want to compute eigenvalues using SimTK::Eigen class. However as soon as I try to call any methods of this class, I get a link error that says: "unresolved ...

Hello Sherm, thank you for your profound reply. Thinking about it again, we came to the same conclusion. I understand that it is hard to find a universally satisfying solution to this problem. Honestly I have no idea what to anwers to your first question. Perhaps one could track the amount of constr...

Hello, at our institute we are using OpenSim for ergonomic design studies. Because we are aiming for a completely virtual analysis tool chain, it is not possible to use experimental data in our simulations. Instead motion sequences are computed using constrainted inverse kinematics. However I encoun...

By the way: Thank You Ayman for the offer to get the source code! This will solve the coexistence of multiple assemblers.
best regards,
Daniel

In the meantime I found a solution for my problem: At the level of simbody it is possible to specifiy custom assembly goals for the kinematic assembler. I already testet it and think it will be useful. The only drawback I see is that an OpenSim:Model always creates its own simbody assembler which ca...

Hello, I am looking for a way to perform inverse kinematics of underdetermined systems. In particular i want to use as few constraints (markers) as possible to solve for a suitable set of coordinates. The idea is to use some kind of scalar objective function to determine an optimal solution in the c...