On 12/20/2013 10:38 AM, bradford wrote:
I use ggplot2 a lot and am wondering why I can't just color with a
function? For example, if value< 0 then use red else use green.
How would you guys suggest to color these bar graphs so that positive is
green and negative is red?
ggplot(melt(df,measure.vars=c("data1", "data2", "data3", "data4")),
aes(x=Month,y=value)) + geom_bar(stat = "identity") + facet_wrap(~variable,
ncol=1, scales = "free_y") + scale_y_continuous(labels=comma)
Hi Bradford,
If you are using numerically designated colors it is fairly easy. Using
your example above:
col<-(value >= 0) + 2
As "red" is equivalent to "2" and "green" to "3" in the default palette,
col will be a vector of 2s and 3s depending upon the sign of "value.
This can be passed to whatever color argument you are using.
Jim
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
