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)?
Many thanks,
Nathan Pearson
nathaniel.pearson at gmail.com