An update to ggtern, version 1.0.3.1, is now available on CRAN!

This version includes a number of updates and functionality, which can be summarized below:

• Inclusion of USDA Soil Classification Data, accessed by: data(USDA)
• Creation of New geometries for ternary errorbars, ie, geom_errorbarT, geom_errorbarL and geom_errorbarR
• Creation of convenience functions (theme_showtitles and theme_hidetitles) for hiding or showing the apex titles
• Creation of convenience functions (theme_showlabels and theme_hidelabels) for hiding or showing the axis ticklabels
• Convenience function for the setting of the ternary arrow baseline (theme_arrowbaseline(value))
• Better handling of convenience functions for hiding (and showing which is new) major or minor gridlines

Further improvements include:

• Improvement on arrow positioning relative to ticks and axis labels.
• Removal of grid elements for existing axes (ie not just using blank elements)
• Creation of theme_minimal, equivalent to the ggplot2 version.
• Creation of theme_classic, equivalent to the ggplot2 version.
• Creation of ggtern.multi function, for arranging multiple plots.
• Changed the default mapping T=y, L=x and R=z, since it is likely that people new to ternary plots will find this more intuitive, created global options so this can be modified.
• Modified logic so that T, L and R ALWAYS relate to the Top, Left and Right apex, regardless of assignment in coord_tern(…).
• Documentation Improvements and Several Bug Fixes.