[R] [R-pkgs] New version of ggplot2: 0.5.7

hadley wickham h.wickham at gmail.com
Fri Jan 11 23:16:36 CET 2008

ggplot2 ------------------------------------------------------------

ggplot2 is a plotting system for R, based on the grammar of graphics,
which tries to take the good parts of base and lattice graphics and
avoid bad parts. It takes care of many of the fiddly details
that make plotting a hassle (like drawing legends) as well as
providing a powerful model of graphics that makes it easy to produce
complex multi-layered graphics.

Find out more at http://had.co.nz/ggplot2, and check out the over 500
examples of ggplot in use.

ggplot 0.5.7

New geoms, scales and aesthetics

  * stat_step and geom_step to draw staircase plots (like plot(type="s"))
  * order aesthetic (currently only for lines/paths) allows you to
control the drawing order within a group
  * scale_manual makes it easier to let ggplot uses the exact
colours/sizes/linetypes that you want
  * scale_reverse allows you to reverse the scale of x and y axes
  * scale_grey is a new black and white scale for categorical data
(colour and fill)

Improved options handling

  * new function opts() to allow modification of plot options by addition
  * update(p, theme_bw) and p + theme_bw now work

These changes mean that you can modify plot options in the same way
that you modify all other aspects of the plot, e.g.  qplot(mpg, wt,
data=mptcars) + opts(title = "Fuel economy vs weight")

Improved documentation

  * many tweaks to the online documentation, particular including the
actual code you need to run for each object!
  * every page now has a link to a form where you can submit feedback
on exactly you do or don't like about a page
  * required aesthetics now listed in documentation
  * geom_polygon now has a decent example
  * numerous minor corrections suggested by Jörg Beyer
  * separated plotting advice from details of plot construction (what
vs how), thanks to Bert Gunter for this suggestion

Improved map projections (with coord_map)

  * coord_map defaults to orientation = c(90, 0, mean(range(y))) -
this ensures that multiple layers line up correctly, but means you
will have to specify the orientation yourself for many projections
  * coord_map now respects limits set by scales
  * removed useless ticks from coord_map

If you're using ggplot to draw maps and have thought of other features
that would make your life easier, please let me know.

Bug fixes

  * adding data and aesthetics in separate steps should now work
  * layers with set parameters will not use mapped aesthetics
  * use LazyLoad: false instead of SaveData: true for better future

  * coord_cartesian: fixed bug that prevented you from overriding the
default axis expansion
  * coord_equal: now scales correctly if ratio < 1
  * geom_abline: fix bug where slope was ignored
  * geom_jitter now works correctly with groups and categorical values
(was actually a bug in how scale_discrete deals with continuous
  * geom_path: automatically switch between polylineGrob and
segmentsGrob when drawing paths so that setting line type now works
  * geom_segment now uses both ends of segments to calculate axis limits
  * plotmatrix: fix bug in scatterplot matrix where all scatterplots
were transposed!
  * qplot: should now work better within functions
  * quickplot added as an alias of qplot, to avoid confusion with qunif, etc
  * scale_*: better error message if you add a scale without a
matching aesthetic mapping in the plot
  * scale_identity no longer converts everything to character
  * scale_identity: grob argument renamed to guide
  * stat_*: made all statistics more robust to errors
  * stat_quantile: fixed bug when only drawing a single quantile
  * stat_smooth: returns silently if <2 non-missing data points

Minor aesthetic improvements

  * coord_polar now specifies aspect.ratio by default, and I've made a
few other tweaks to make polar coordinates plot look nicer
  * geom_bar no longer draws gray borders by default, but instead uses
the same colour as fill (this eliminates a tiny gap between
neighbouring bars)
  * plotmatrix: tweaks to improve display of scatterplot matrix
  * scale_brewer: added option to reverse palette
  * scale_colour: colour and fill legends now look exactly the same
(previously colour was missing a grey border)
  * scale_discrete has slightly larger expansion (0.75 vs 0.5)
  * stat_bar: only output bars with > 0 count

See CHANGELOG for changes in previous versions


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