Search found 125 matches

by Tim Dorn
Thu Nov 07, 2013 11:55 am
Forum: OpenSim
Topic: Repeatability of Forward Dynamic Simulations
Replies: 2
Views: 980

Re: Repeatability of Forward Dynamic Simulations

I think its reasonable to expect differences using different machines precisely because the systems are highly non linear and unstable. Even a one bit difference in the state at any time will result in divergance for the rest of the simulation. This could be hardware dependant or operating system de...
by Tim Dorn
Wed Oct 02, 2013 12:01 am
Forum: OpenSim
Topic: Matlab function undefined btk_animate_markers
Replies: 1
Views: 587

Re: Matlab function undefined btk_animate_markers

Hi Liz, I'm not sure which example you're running but the one provided with the latest toolbox version (1.71) at https://simtk.org/project/xml/downloads.xml?group_id=341 does not contain that file. I've searched my computer and also couldn't find that file. I would suggest using the example provided...
by Tim Dorn
Wed Oct 31, 2012 9:27 am
Forum: OpenSim
Topic: C3D Extraction Toolbox installation problem (Gait extract)
Replies: 7
Views: 2958

Re: C3D Extraction Toolbox installation problem (Gait extrac

It could be a problem with having admin access to your toolbox location. You could try adding the path manually in Matlab: File -> Set Path. If you still can't add the path this way, then there is permissions problem and you will need to speak to your computer administrator.
by Tim Dorn
Mon Oct 01, 2012 10:14 am
Forum: OpenSim
Topic: C3D Extraction Toolbox installation problem (Gait extract)
Replies: 7
Views: 2958

Re: C3D Extraction Toolbox installation problem (Gait extrac

This error occurs because you are using a 64 bit version of Matlab. The c3dserver utility (which comes with the toolbox) does not work with a 64-bit version of Matlab. You will need to revert to the 32-bit version, which seems to fix the problem.

Cheers,
Tim
by Tim Dorn
Thu Jan 12, 2012 4:54 pm
Forum: Tim's OpenSim Utilities
Topic: Segment Acceleration
Replies: 4
Views: 1594

Re: Segment Acceleration

The segment power analysis is now available with the IndAccPI plugin. Note that you must use this plugin with version 2.4 (VC10) build of OpenSim.

Tim
by Tim Dorn
Sun Nov 20, 2011 5:49 pm
Forum: C3D Extraction Toolbox
Topic: Expansion to Kistler (type 1 FP) and/or BTS
Replies: 1
Views: 890

Re: Expansion to Kistler (type 1 FP) and/or BTS

Hi Stefan, Although you cannot directly extract from a type 1 FP, if you have Vicon Nexus (or perhaps other software can also do it), is load the C3D file in and re-save it. Vicon Nexus also only deals with type 2 FP when it saves a C3D file, but if upon loading other FP types, will automatically co...
by Tim Dorn
Thu Oct 06, 2011 5:40 am
Forum: Tim's OpenSim Utilities
Topic: Segment Acceleration
Replies: 4
Views: 1594

Re: Segment Acceleration

Hi Allison, I suppose in theory that if you know the induced acceleration of a joint and the location of the center-of-mass of the segment with respect to the joint, then you could find the induced acceleration of the segment. However, this is not currently implemented. In the next version (which I ...
by Tim Dorn
Wed Aug 17, 2011 5:20 pm
Forum: C3D Extraction Toolbox
Topic: Force Plate Data
Replies: 1
Views: 918

RE: Force Plate Data

<t>Hi Cindy,<br/> <br/> Information on the different types of force plates can be found in the manual (section 4.2). If you don't have a type 2 force plate, you can't use the toolbox to extract GRFs. You can still however get the marker positions from the c3d file - simply use getMarkers.m to get th...
by Tim Dorn
Sat Jul 16, 2011 1:33 am
Forum: C3D Extraction Toolbox
Topic: The movie can't be played when OPT=2
Replies: 1
Views: 855

RE: The movie can't be played when OPT=2

<t>Hi Yi,<br/> <br/> I'm not quite sure what is going on there. This appears to be a Matlab/Windows issue, not a toolbox issue. I have not done any testing with Windows 7 so I can't provide much assistance there. I really only recommend the toolbox to be used under Windows XP(32 bit) and Matlab 2010...
by Tim Dorn
Fri Apr 08, 2011 4:55 pm
Forum: C3D Extraction Toolbox
Topic: some questions (yi wang)
Replies: 6
Views: 1846

RE: some questions (yi wang)

Hi Marta,

Perhaps you could send me your c3d file and loadlabels.m file that you are using (t.dorn@pgrad.unimelb.edu.au), and I'll take a quick look to see if I can identify your problem.

Tim