def plot_radius(self):
plot_rad = <NUM_LIT:0><EOL>for group, nodelist in self.nodes.items():<EOL><INDENT>proposed_radius = len(nodelist) * self.scale<EOL>if proposed_radius > plot_rad:<EOL><INDENT>plot_rad = proposed_radius<EOL><DEDENT><DEDENT>return plot_rad + self.internal_radius<EOL>
Computes the plot radius: maximum of length of each list of nodes.