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* Color palettes generated by `brewer_pal` no longer give warnings when fewer
than 3 colors are requested. (Winston Chang)
* `abs_area and `rescale_max` functions have been added, for scaling the area
of points to be proportional to their value. These are used by
`scale_size_area` in ggplot2.
Version 0.2.2
* `zero_range` has improved behaviour thanks to Brian Diggs.
* `brewer_pal` complains if you give it an incorrect palette type. (Fixes #15,
thanks to Jean-Olivier Irisson)
* `shape_pal` warns if asked for more than 6 values. (Fixes #16, thanks to
Jean-Olivier Irisson)
* `time_trans` gains an optional argument `tz` to specify the time zone to use
for the times. If not specified, it will be guess from the first input with
a non-null time zone.
* `date_trans` and `time_trans` now check that their inputs are of the correct
type. This prevents ggplot2 scales from silently giving incorrect outputs
when given incorrect inputs.
* Change the default breaks algorithm for `cbreaks()` and `trans_new()`.
Previously it was `pretty_breaks()`, and now it's `extended_breaks()`,
which uses the `extended()` algorithm from the labeling package.
* fixed namespace problem with `fullseq`
Version 0.2.1
* `suppressWarnings` from `train_continuous` so zero-row or all infinite data
frames don't potentially cause problems.
* check for zero-length colour in `gradient_n_pal`
* added `extended_breaks` which implements an extension to Wilkinson's
labelling approach, as implemented in the `labeling` package. This should
generally produce nicer breaks than `pretty_breaks`.
* `alpha` can now preserve existing alpha values if `alpha` is missing.
* `log_breaks` always gives breaks evenly spaced on the log scale, never
evenly spaced on the data scale. This will result in really bad breaks for
some ranges (e.g 0.5-0.6), but you probably shouldn't be using log scales in
that situation anyway.
Version 0.2.0
* `censor` and `squish` gain `only.finite` argument and default to operating
only on finite values. This is needed for ggplot2, and reflects the use of
Inf and -Inf as special values.
* `bounds` functions now `force` evaluation of range to avoid bug with S3
method dispatch inside primitive functions (e.g. `[`)
* Simplified algorithm for `discrete_range` that is robust to
`stringsAsFactors` global option. Now, the order of a factor will only be
preserved if the full factor is the first object seen, and all subsequent
inputs are subsets of the levels of the original factor.
* `scientific` ensures output is always in scientific format and off the
specified number of significant digits. `comma` ensures output is never in
scientific format. (Fixes #7)
* Another tweak to `zero_range` to better detect when a range has zero length.
(Fixes #6)
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