simtk.org

Hello.
I've recently started working with OpenSim. One of the things I wanted to do, was to gather data concerning relations between muscle fibre length and joint angles in a human arm. While GUI offers nice and intuitive ways to plot correct graphs, and to export them into formats understood by OpenSim, I can't seem to find a way to prepare them for use with Excel/MatLab.
Any help would be appreciated, and thanks in advance!

Please refer to the User's Guide on Confluence (https://simtk-confluence.stanford.edu/d ... %27s+Guide)---specifically, see the "Exporting and Printing" page in the "Plotting" section: https://simtk-confluence.stanford.edu/d ... d+Printing.

That's actually exactly what I did- and I had no problems exporting it as an .sto or .mot file, but I can't seem to get them to work in any other program than OpenSim itself.

.sto and .mot files are tab delimited; they can be opened/imported in Excel and MATLAB. You can also open them in a text editor like Notepad++. I would try opening reference files found in your OpenSim installation directory (e.g., C:\OpenSim 3.3\Models\Arm26\OutputReference\ForwardDynamics\PhysiologicalResults) to determine whether the issue is with opening a file of this type or saving from the plotter.

Thanks for the suggestion!
The problem seems to lie in exporting the data itself. Example files work as intended, but the ones created by exporting data from a plot into a *.sto or *.mot file are empty, and weigh 0b.

I did not encounter an issue. Here were my steps:
- start OpenSim 3.3 GUI
- open arm26.osim model
- Tools -> Plot...
- Y-Quantity -> fiber-length
- Muscles... -> BRA
- X-Quantity -> r_elbow_flex
- click "Add" button
- right-click plot area -> Export Data...
The resulting file can be opened in Excel and generates the same plot shown in the GUI.