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. 2014 May 9;9(5):e97145. doi: 10.1371/journal.pone.0097145

Figure 1. A rotation matrix was applied rotating the data through an angle θ.

Figure 1

A rotation matrix was calculated from the field vertices and applied to the players' positions, rotating the data through an angle θ in order that the longitudinal displacements were aligned with the x-axis and the lateral displacements were aligned with the y-axis.