Python Programming for Biology: Bioinformatics and Beyond

Figure 23.2.  An illustration of three clusters of points in two dimensions. Each

cluster is shown by a different kind of shape. Points are plotted at different positions

relative to the two axes, which represent two different quantities relating to the data. The

data categories may be known in advance, in which case the plot can be used to illustrate

the degree of separation in the data. Alternatively, the clusters in the data may be inferred

by analysis of the spatial relationship of the data points, by grouping points with similar

axis locations (i.e. features).