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Changes in Version 0.6-18

 o combineLimits() fixed to work with empty panels

Changes in Version 0.6-15

 o graphical parameters vectorized in panel.3dbars().

 o new panel function panel.ellipse().

Changes in Version 0.6-15

 o panel.xyarea() gains a 'horizontal' argument.

 o layer() now works with splom.

 o panel.ellipse() [was introduced previously but not mentioned here].

 o changes to panel.smoother,quantile,xyarea to work with the new 
   'col' default in panel.superpose(): now "black" rather than NA.

Changes in Version 0.6-14

 o new combineLimits() function for per-row and per-column limits.

 o new functions xscale.components.* and yscale.components.*
   where * is in {logpower,fractions,log10ticks,log10.3,subticks}.

 o horizonplot substantially revised, with an argument 'horizonscale'
   (actually for prepanel), "free" scales and colorkey support. 
   Also the default colors are better now (thanks to Joseph Guillaume).

 o new functions ggplot2like(), ggplot2like.opts() and axis.grid().

 o new functions theEconomist.opts() and theEconomist.axis().

 o panel.mapplot() now takes an 'exact' argument, similar to map().

 o new function panel.key().

 o c.trellis() and doubleYScale() now have an option to merge legends.

 o c.trellis(), as.layer() and doubleYScale() now try to combine 
   'par.settings' from multiple plots.

 o doubleYScale() now accepts an 'under' argument (applies to 2nd plot).

 o marginal.plot() now has a default cut = 0.

 o layer() failed on expressions with missing arguments, like x[,1].

 o removed the deprecated arguments to layer(), 'eval' and 'etc'.

 o simpleSmoothTs() and panel.tskernel() used an incorrect (reversed)
   filter in the case of sides = 1 and c > 1.

 o as.layer() was not keeping existing scales if x.same or y.same = FALSE.

 o xyplot.list() now applies 'FUN' directly, avoiding some evaluation issues.

 o the 'style' argument to layer() now applies to the "superpose" styles
   also, which fixes some cases with xyplot.ts.

 o the 'zoo' methods for panel.xblocks() and panel.xyarea() now use 
   coredata() rather than as.vector(), so can keep factors intact.

Changes in Version 0.6-10

 o support arrows with panel.segplot.

 o several changes to panel.xblocks().

 o layer() now has a 'magicdots' argument, which is TRUE by default.

 o use of the 'eval' and 'etc' arguments to layer() are now deprecated.

 o new function simpleSmoothTs (calculations as in panel.tskernel).

 o panel.tskernel() gains a new argument 'n' (default 300) to reduce the
   number of plotted points.

 o panel.qqmath.tails() is now deprecated as its main functionality
   has been moved into panel.qqmath() (in lattice 0.18-4, from R 2.11.0).

 o glayer() was failing on plots with an existing 'panel.groups'.

 o panel.smoother() now omits non-finite values and converts to numeric.

 o panel.xyarea() (and thus horizonplot()) now handles missing values.

Changes in Version 0.6-6

 o xyplot.ts actually removed now (forgot to delete it after lattice release).
 
 o new function horizonplot().

 o fixed rescaling bug in panel.tskernel(..., sides = 1).

 o mapplot can now take colramp = NULL to use the current theme.

Changes in Version 0.6-5

 o new panel functions panel.smoother() and panel.quantile().
   The latter requires the quantreg package.

 o new panel function panel.tskernel().

 o layer() rewritten and now has several new arguments.
   New convenience functions layer_(), glayer(), etc.

 o new functions theEconomist.theme() and asTheEconomist().

 o custom.theme() gains a `...` argument passed to simpleTheme.
   Added a variant custom.theme.2() with different defaults.

 o expanded xyplot.ts() and moved it to the lattice package.

 o improved handling of colours in panel.xblocks().
   Added several more examples to the help page.

 o fixed panel.xblocks() to handle cases of no missing data.

Changes in Version 0.6-4

 o as.layer() gains arguments x.same and y.same.

Changes in Version 0.6-2

 o new functions 'panel.xblocks', 'panel.qqmath.tails',
   'panel.xyarea' and 'panel.qqmath.xyarea'.

 o added explicit 'layout' argument to 'marginal.plot'
   (was clobbered by the default NULL in 'c.trellis').

 o 'c.trellis' handles 'subscripts' argument to prepanel functions.

Changes in Version 0.6-1

 o fixed 'layout' argument to 'xyplot.list' and 'c.trellis'.

Changes in Version 0.6-0

 o new function xyplot.list, to create and merge multiple plots
   (and not just xyplots).

 o c.trellis will now set same scales properly when x/y.same=TRUE.

 o new function doubleYScale, to easily overlay two plot series.

 o new functions panel.lmlineq and panel.ablineq for line equations.

 o marginal.plot handles non-syntactic variable names;
   also now coerces to data.frame (so e.g. works with a matrix).

 o changes to default axis style in marginal.plot.

 o new dataset EastAuClimate.

Changes in Version 0.5-4

 o marginal.plot now handles table objects sensibly.

 o marginal.plot now applies 'subset' to 'groups', as it should.

Changes in Version 0.5-3

 o improvements to marginal.plot including support for groups.

 o fix to marginal.plot: failed with only numeric variables.

 o fix to panel.voronoi (with use.tripack = FALSE):
   wrong colors were used when xlim/ylim enclosed a data subset.

 o new function 'as.layer' and a method 'as.layer.trellis'.
   This allows panels to be overlaid with independent x/y scales.

Previous Changes

 o several new data sets and a few utility functions

 o dendrogramGrob to produce a dendrogram that can be used as a legend

 o new generic function 'gplot' -- like 'plot', but meant to produce a
   `grouped' Trellis plot.  Methods can be defined for objects that
    already have a 'plot' method.  API Currently unstable.