nViZn : An Algebra-Based Visualization System

We describe a system, called nViZn, that implements a language for quantitative graphics. The structure of this system differs from existing statistical graphics, visualization, and mapping systems. Instead of treating a graphics display as a viewer for underlying data, nViZn treats data as an accessory to viewing a graph. nViZn is based on the mathematical definition of the graph of a function and uses that definition to organize data linked to the graph.