Ayman,

I did not use the CoordinateCoupler constraint. I just tried to reference the same coordinate twice.

CoordinateCoupler works at treat - thanks.

Simon

<t>Hi,<br/> <br/> Can I use one DOF to specify the joint angle of two separate joints? e.g. use the knee flexion angle to specify the flexion angle of an (added) patella relative to the tibia? Obviously, I would need to use cubic spline fitting to map a knee flexion angle into a patella angle. <br/>...

<t>Hi,<br/> <br/> I have a model that is solving the slow target problem well, but failing to solve one time increment of fast target, whether using large reserves (actuators replaced) or ligaments plus large reserves (actuators appended).<br/> <br/> The output of the optimiser says:<br/> "Error: In...

Maybe a simpler way of asking this question is to ask if a generalised coordinate can be used as a control? If so, does it need to be added to the control constraints file?

<t>Hi,<br/> <br/> I have a number of reasons to want to leave the determination of a generalised coordinate up to the load balance between attached muscle-tendon or ligament units. This is for the case of coordinates that are not easily measured non-invasively, but able to be determined by the solut...

If OpenSim crashes completely when you load data then it is most likely that there are spaces between time series data or non numeric (NaN) information. See if you can cut out the regions where there is incomplete data or interpolate to fill the gaps.

Hope this helps
Simon

<t>Hi,<br/> <br/> When using a Schutte 1993 muscle, you can specify a force-length curve for the tendon. However, I am not sure how this curve is normalised.<br/> <br/> What is the x-axis - the "norm length"? <br/> <br/> Is it total tendon length / tendon rest length? Or displacement / tendon rest l...

Further to the request above, I am often getting a problem where the force vector disappears or becomes completely opaque.

<t>Hi,<br/> <br/> The ID tool is working well for my horse model, but it would be great if I could change the scale of the force vector for the sake of visualisation. Since the loads that I am using for analysis are at least 5 times that of the human, the force vector engulfs the entire model! <br/>...

<t>I think I have solved the problem. By de-constructing the model down to one joint and back again I found two causes:<br/> <br/> 1. One inertial value was reasonably small and when modified I was able to extract results. Note that this value was not excessively small.<br/> 2. I had a locked joint ...