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. Author manuscript; available in PMC: 2019 Nov 1.
Published in final edited form as: Arch Phys Med Rehabil. 2018 Apr 10;99(11):2175–2182. doi: 10.1016/j.apmr.2018.03.006

Figure 1.

Figure 1

Data from multiple walking trials are concatenated together. In some trials there is poor or missing data for some channels. When weighted non-negative matrix factorization is used, the regions of poor or missing data are given zero weight and not incorporated into the update rules for non-negative matrix factorization. This approach allowed us to maximize the amount of data for analysis As with traditional non-negative matrix factorization, synergy weights, activations and total variance accounted for by a given number of synergies are the outputs.