[R] Stacked barplot: specifying individual bar hue/luminance

[Uwe Ligges]

chaski01 wrote:
> Hi all,
> 
> I'm trying to generate barplots from simple but long (~100000-row) data
> files, in which each bar will comprise two stacked 'sub-bars'.  All the
> upper sub-bars will have the same hue, and all the lower bars will,
> likewise, have another uniform hue.  However, I wish to specify the
> luminance (aka brightness) of each bar (i.e., each whole bar comprising two
> sub-bars) separately, and I wish the plot to render without spaces between
> successive bars. 
> 
> I've been trying to get this going in ggplot2.  Two problems arise: first,
> I'm unable to eliminate the spaces between successive bars.  And second (and
> more importantly), while I can vary transparency (i.e., alpha) of bars
> singly, I'm not sophisticated enough with the grammar to know how to define
> a color palette that lets me vary the luminance singly.  Can anyone suggest
> how to do this, either in ggplot or in basic R (or some other package)?


See ?hcl

Best wishes,
uwe Ligges


> Many thanks,
> 
> Nathan Pearson
> nathaniel.pearson at gmail.com