Figure 3.

(a) Spatial entropy of the striking position. Plots (a–c) have been generated numerically, whereas (d) is a real case. Specifically, in (a) the stroke positions were biased toward the four corners of the court. The corresponding spatial entropy is 0.462. In (b), the strokes were randomly distributed, leading to $H_s=0.997$. (c) It corresponds to the case where the strokes are placed following a regular lattice, maximizing the distances between them and leading to $H_s=1.985$. Finally, (d) corresponds to the striking position of Carolina Marín playing against Chen Xiaoxin during the China Open 2018. In this case, $H_s=0.599$.