<t>Hi Rudi,<br/> <br/> Thank you for your useful comment.<br/> <br/> My COP in x direction goes up to 300 but kinematics of markers range from -1 to 1.5 in x direction througout the motion. <br/> <br/> Similarly, z COP is much bigger in magnitute than markers kinematics.<br/> <br/> Maybe they are in...

<t>Hi,<br/> <br/> I see. I am just wondering for the walker_tibia and walker_femur associated with tibia and femur in Arnold's model 2010, they have mass = 0. Could that be the problem?<br/> <br/> I have just tried ID without external force. Pelvis_list and tilt moment resembles grf curve, but with ...

<t>Hi Rudi,<br/> <br/> Thanks for your comment.<br/> <br/> I didn't tick 'point is global' before but i tried with it ticked just now and the error message said <br/> <br/> 'Exception:<br/> InverseDynamics: ERROR- mass matrix is singular'<br/> <br/> any idea?<br/> <br/> also, how do you check if COP...

<t>Hi,<br/> <br/> Thank you for your help. RRA is still not running. <br/> <br/> I have ID output with the GRF applied to the correct calcaneous now. But the net joint moment is still very high, of magnitude up to 10000.<br/> <br/> I have seen other user reporting around 6-100 for the pelvis residua...

I got this from the message window after RRA failure.

Exception:
InverseDynamics: ERROR- mass matrix is singular

Has anyone experienced this before?
I thought RRA does not involve ID.

Thank you.

<t>Hi, <br/> <br/> I am interested in the flexion angle of the tibiofemural joint (TFJ). I would like to know how the centre of rotation is defined. Does it have an instantaneous centre of rotation, or a fixed one? Knee flexion angle generated from OpenSim is 10 degree higher constantly then my resu...

<r>Hi,<br/> <br/> RRA initially crashed without any warning. After reading <URL url="http://wiki.simtk.org/opensim/rraCmcPage">http://wiki.simtk.org/opensim/rraCmcPage</URL> and other forum post I have a few things that I am not sure about.<br/> <br/> - I know how to ensure that a joint is locked in...

<t>Hi,<br/> <br/> Does anyone has a better way of solving this problem? It worked before but now it either crashes without giving any warning or in the message panel, it says the sto. file cannot be found. Please help.<br/> <br/> I loaded the setting file which I saved before and it worked, and now ...

<t>Hi,<br/> <br/> I got very high outcome from ID as well. Did you have any luck strengthening the model. How do you determine how much reserve actuation is required?<br/> <br/> Also, should static optimisation be run straight after ID or after RRA since RRA would give a more reliable model file?<br...

<t>Hi,<br/> <br/> I obtained a sto file from ID which only has columns labels as moment of each joint. However, when they are plotted against time, it does not give moment curve.<br/> <br/> From my previous understanding, ID generates joint forces and joint moments. Why does it only give moment colu...