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Changelog

biplotEZ 3.0

(September 2026)

New features

  • ggplot2 is now the default plotting engine. plot() gains an engine argument, which takes "ggplot2" or "base".
  • New gg_biplot() builds a biplot as a ggplot object.
  • New autoplot() method for biplot objects, plus print(), plot() and + methods for the resulting gg_biplot objects. The + method lets you add your own ggplot2 layers.
  • New MCA() function for multiple correspondence analysis biplots. The indicator matrix variant is available in this release.
  • fit.measures() now reports overall quality for MCA biplots.
  • New CatPCA() function for categorical PCA biplots, with nom.axes() and ord.axes() to format nominal and ordinal axes.
  • plot() gains an add argument, so a biplot can be drawn on top of an existing plot.
  • axes(), newaxes(), nom.axes() and ord.axes() gain label.dir = "Along", which places each axis title alongside its axis line, rotated to the slope of the axis. The default label.dir is now NULL, meaning "Along" with the ggplot2 engine and "Orthog" with base graphics.
  • The biplot object now stores p2, the number of categorical variables.
  • New vignette section on MCA. The CA vignette is now called “CA and MCA in biplotEZ”.
  • More examples added to the PCA() and CA() documentation.

Breaking changes

  • CATPCA() has been renamed to CatPCA().
  • axes_coordinates() is no longer exported.
  • biplot() now stops with an error if a numeric variable has zero standard deviation.
  • The default plotting engine changed from base graphics to ggplot2. Some features are not supported by the ggplot2 engine yet and fall back to base graphics with a warning. These are zooming, 1D and 3D biplots, CatPCA() nominal and ordinal axes, and spline axes.
  • MCA biplots are only drawn with the ggplot2 engine.
  • legend.type(new = TRUE) is a base graphics feature only. The ggplot2 engine always places the legend next to the biplot.

Bug fixes

  • Fixed correlation PCA.
  • Fixed correlation PCA for the case where p > n.
  • Fixed newsamples() for CA biplots in base graphics.
  • Fixed legend.type() for the ggplot2 engine.
  • Fixed label aesthetics and label placement.
  • ggrepel is no longer used in base graphics plotting.
  • Fixed a typo in the CVA vignette.

Internal changes

  • The spline axis code was translated from Fortran to C++ using Rcpp. The call to optim() was replaced by a Nelder-Mead routine written in C++.
  • Unused Fortran helper functions were removed.
  • Compiled build artefacts are no longer tracked in the repository.
  • Depends: R (>= 3.6.0) added.
  • Rcpp added to Imports and LinkingTo.
  • RColorBrewer added to Suggests. grid, R.devices and testthat removed.

biplotEZ 2.2

CRAN release: 2024-11-13

(November 2024)

biplotEZ 2.1

CRAN release: 2024-09-14

(September 2024)

biplotEZ 2.0

CRAN release: 2024-07-08

(July 2024)

biplotEZ 1.2.0

CRAN release: 2023-11-28

(November 2023)

biplotEZ 1.1.0

CRAN release: 2023-11-18

(November 2023)

biplotEZ 1.0

CRAN release: 2023-08-31

Initial CRAN submission. (August 2023)