NEWS.md

In rrrlw/ggtda: 'ggplot2' Extension to Visualize Topological Persistence

ggtda v0.1.0

This is the inaugural release. It contains several basic plotting layers and associated themes, with a small data set and two vignettes for illustration.

barcode and persistence diagrams

The geom_barcode() layer takes persistence data with the two required aesthetics start (or xmin) and end (or xmax) and produces a barcode diagram, which can optionally be grouped and color-coded by an additional variable (usually dimension).

The stat_persistence() and stat_frontier() layers also take persistence data, though they only accept the required aesthetics start and end. They transform these data into the coordinates of a persistence diagram and into the endpoints of line segments that outline the persistence frontier, respectively. They can be oriented according to "flat", diagonal, or landscape formats.

The themes theme_persist() and theme_barcode() format plots to resemble the persistence and barcode diagrams found in the literature.

illustration tools

The stat_disk(), stat_vietoris*(), and stat_cech*() layers can be used to visualize the raw mathematical elements of persistent homology on a point cloud in the coordinate plane. By default, they use the geom_face() layer, which is equivalent to geom_polygon() but with different aesthetic defaults.

vignettes

The two vignettes illustrate these two collections of tools. The vignettes call the tdaunif and ripserr packages, for this reason included under Suggests in the DESCSRIPTION, to generate data and compute persistent homology.

rrrlw/ggtda documentation built on April 14, 2024, 2:24 p.m.