Visualization is the presentation of data in a variety of graphical and pictorial formats. The reader will be familiar with examples such as pie and bar charts. Visualizations help us see things that are not immediately obvious, even when data volumes are very large patterns can be spotted quickly and easily.
Interactivity is one of the useful features of successful visualizations, providing the ability to zoom, filter, segment, and sort data.
In this section, we will look at the extremely powerful Gadfly Julia package.
Gadfly is a large and complex package, and provides great flexibility in the range and breadth of the visualizations possible in Julia. It is equivalent to the ggplot2 R module and similarly is based on the The Grammar of Graphics seminal work by Leland Wilkinson.
The package was written by Daniel Jones, and the source on GitHub contains numerous examples of visual displays together with the accompanying code.
An entire text could be devoted just to Gadfly...
