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To append data from a motion file to a motion that is already loaded into OpenSim:

  1. Expand the Motions branch in the Navigator. 

  2. Right mouse click on the desired motion and select Append Data. 

  3. OpenSim will open a file browser, which you can use to select the desired motion file.

To append data from this file to an existing motion, the data must satisfy two criteria:

  1. The data must contain all of the time frames in the existing motion, and the time of each frame must match exactly (to within the precision used in the two motion files). If there are one or more time frames in the existing motion that are not in the file, OpenSim will print an error message and cancel the append command. If the file contains time frames not in the existing motion, they will be ignored.

  2. The data cannot contain values for coordinates or markers that are in the existing motion. If it does, OpenSim will print an error message and cancel the append command. If the file contains other data columns (e.g., ground-reaction forces) with names that are used in the existing motion, they will be appended, resulting in duplicate column names in the existing motion.


Once the data has been appended to the existing motion, it can be animated and plotted just like the original data. If you save the motion to a file, the original data and the appended data will both be written to the file.

Next: Closing a Motion

Previous: Loading a Motion

Home: Loading and Saving Models and Motions

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OpenSim is supported by the Mobilize Center , an NIH Biomedical Technology Resource Center (grant P41 EB027060); the Restore Center , an NIH-funded Medical Rehabilitation Research Resource Network Center (grant P2C HD101913); and the Wu Tsai Human Performance Alliance through the Joe and Clara Tsai Foundation. See the People page for a list of the many people who have contributed to the OpenSim project over the years. ©2010-2024 OpenSim. All rights reserved.