Thanks both! That is a nice new feature.

Hi all, In most simulations that most of us do in Moco, the variables that are optimized (i.e. the "design variables) all vary over a range of approximately [-1, +1], for example muscle excitations, muscle activations, CC lengths, normalized SEC forces, joint angles in radians, etc. In a current sim...

Hi Soyoung, I would not equate RRA with filtering. There will be non-zero residuals in an inverse dynamics analysis even in a hypothetical situation where the skeletal motion and external forces are measured with perfect accuracy. I recommend the following paper, where the first few paragraphs descr...

For example, this morning I started a simulation of walking with a prosthetic limb that adds a degree of freedom (pistoning) between the residual limb and prosthesis. Previously I've been modeling that interface as rigid. As the initial guess for this simulation, I used a previous simulation with th...

I second Nick's recommendation to start simple and add complexity from there. When I first started using Moco, I started with the "example2Dwalk" example, which runs fast and converges on a good result. Then I gradually made one change at a time to that model and setup, for example first I changed i...

I've never seen this one before but from the reference to "resampling" I'm guessing it's something related to the initial guess. My guess would be it's re-sampling the initial guess and somehow getting a final time in the guess of 1.799999999999... or something, when the problem is specifying a fina...

Sounds like I should see what the return policy is on the 12-core CPU / 30-core GPU I just bought.

Hi all, I've been using the Matlab script "c3dexport.m" to convert C3D files into TRC and MOT files for AddBiomechanics. Is there a way to replace the data in the osimC3D variable (it's named "c3d" in the code below) with modified data, before writing the data to the TRC and MOT files? Filtering/smo...

Hi Nick, I would use whatever speed the subject(s) in the tracking target data walked at, but I also doubt that an inconsistency there is the source of the hip JCF issue. Various questions below: - What does the overall tracking result look like? Is it tracking the target data fairly well? - What ar...

Hi Christian, A couple things to try/consider: (1) Try turning the tracking weight on the GRF way high and seeing if the solution then has good tracking of them. This will most likely come at the cost of other terms in the cost function, but it can help with identifying the issue. (2) From the image...