Figure 2
From: Gravitation field algorithm and its application in gene cluster
The figures of the rules of the motion of the dusts. The bell curve is the mass function. The round node is the mass value of the centre dust f (xmax). The up triangle node is the mass value of surrounding dust x1 f(x1). The down triangle node is the mass value of surrounding dust x2 f(x2). Sub-figure (a) is a small group which has 3 dusts. Sub-figure (b) is the figure of motion of the surrounding dusts toward the centre dust. In the sub-figure (c), the mass value of the surrounding dust x2 is bigger than the mass value of the centre dust. And the centre dust becomes a surrounding dust which is coded x2; the surrounding dust x2 becomes the centre dust. In the sub-figure (d), the mass value of the surrounding dust x2 is bigger than the mass value of the centre dust. The surrounding dust x2 becomes the centre dust again.