Search found 45 matches

by Marc Carmichael
Thu Jul 22, 2010 4:57 pm
Forum: OpenSim
Topic: OpenSim on Linux - 64bit?
Replies: 4
Views: 309

RE: OpenSim on Linux - 64bit?

Hi Ayman,

That's great news. I look forward to the release :)


Cheers

Marc

by Marc Carmichael
Thu Jul 22, 2010 1:31 am
Forum: OpenSim
Topic: OpenSim on Linux - 64bit?
Replies: 4
Views: 309

OpenSim on Linux - 64bit?

<r>Hi everyone,<br/> <br/> I am trying to get OpenSim running on a 64 bit Linux cluster, but in order to get my c++ program working with the OpenSim 2.0.2 Linux libraries I have to compile it as a 32 bit program.<br/> <br/> The problem is I also want my program to link with existing 64 bit libraries...
by Marc Carmichael
Sat Jun 12, 2010 8:20 am
Forum: OpenSim
Topic: Body Mass, Inertia & Mass Center Data
Replies: 9
Views: 726

RE: Body Mass, Inertia & Mass Center Data

<t>Hi Priyanshu,<br/> <br/> Yeah I had the same issue with the axis colours. That's why I selected the "Show Axes" of the ground body. Since it has zero rotation in the ground coordinate system (you can verify this by looking at the body's information) then its coloured axes are aligned with the glo...
by Marc Carmichael
Sat Jun 12, 2010 12:50 am
Forum: OpenSim
Topic: Body Mass, Inertia & Mass Center Data
Replies: 9
Views: 726

RE: Body Mass, Inertia & Mass Center Data

<t>Hi Priyanshu,<br/> <br/> I can't remember exactly, but something along the lines of clicking on the body in the navigator and selecting "show axes". It will show a color coded x-y-z set of axis. I can't remember which color stands for which axis, but you can easily work this out by showing the ax...
by Marc Carmichael
Thu Jun 10, 2010 6:35 pm
Forum: OpenSim
Topic: ID: ERROR - mass matrix is singular
Replies: 5
Views: 475

RE: ID: ERROR - mass matrix is singular

Thanks, I wrote a simple program that cycles though each body and gives it an infinitesimally small mass and inertia matrix. After this the ID worked.

Cheers
by Marc Carmichael
Thu Jun 10, 2010 6:33 pm
Forum: OpenSim
Topic: Body Mass, Inertia & Mass Center Data
Replies: 9
Views: 726

RE: Body Mass, Inertia & Mass Center Data

<t>HI,<br/> <br/> I had the same problem. I obtained approximate mass/inertia data for the upper limb from two sources. One was David Winter's "Biomechanics and Motor Control of Human Movement". This book has equations for estimating the lengths, mass, and centre of gravity for each segment in the u...
by Marc Carmichael
Sun May 23, 2010 11:51 pm
Forum: OpenSim
Topic: ID: ERROR - mass matrix is singular
Replies: 5
Views: 475

ID: ERROR - mass matrix is singular

<t>Hello,<br/> <br/> I am performing an inverse dynamics simulation with the Stanford upperlimb model. When I load my .mot file I get the error "InverseDynamics: ERROR - mass matrix is singular".<br/> <br/> My ideas for the possible cause of the error are the following:<br/> <br/> 1 - I made an arti...
by Marc Carmichael
Wed May 19, 2010 1:04 am
Forum: OpenSim
Topic: Calculating max torque capacity about a joint
Replies: 1
Views: 239

RE: Calculating max torque capacity about a joint

<r>I have started to write my program, I am beginning with the OptimizerExample.cpp program which is one of the API examples that comes with OpenSim.<br/> <br/> So what I want to do is remove the dynamic optimization which is done in the example to maximise the arm velocity, and instead replace it w...
by Marc Carmichael
Tue May 18, 2010 9:53 pm
Forum: OpenSim
Topic: Calculating max torque capacity about a joint
Replies: 1
Views: 239

Calculating max torque capacity about a joint

<r>Hello everyone,<br/> <br/> Firstly let me thank the developers of OpenSim for such a nice program! An also a big thanks to everyone who have already helped me on previous threads. I am new to OpenSim so excuse me if my questions seem simple.<br/> <br/> I wish to perform an analysis using the Stan...
by Marc Carmichael
Mon May 17, 2010 12:37 am
Forum: OpenSim
Topic: Calling static optimization from main program
Replies: 4
Views: 338

RE: Calling static optimization from main program

<t>Hi everyone.<br/> <br/> From the sounds of it I am hoping to do something similar to Michael. I wish to use the OpenSim API to load a model, set the state (joint angles, external forces, etc) and then perform static optimization to calculate the forces in the individual muscles.<br/> <br/> But I ...