[R] Histogram color
dwinsemius at comcast.net
Thu Mar 4 15:16:15 CET 2010
On Mar 4, 2010, at 7:41 AM, Ashta wrote:
> In a histogram , is it possible to have different colors?
> Example. I generated
> x <- rnorm(1000000)
> I want the histogram to have different colors based on the following
> mean(x)+sd(x) with red color and mean(x) - sd(x) with red color as
> well. The middle one with blue color.
bkrs <- hist(x); hist(x, col= ifelse(bkrs$mids< 0-1,"red", ifelse(bkrs
$mids> 0+1, "blue", "black" ) ) )
This has the side effect of first plotting a "histogram" with bars
that have default fill but then gathers the values in an object bkrs
that is used to assign colors based on midpoints. Following your lead,
I used the default values for mean and SD, so filling them in is left
as an an exercise for the poster.
> Is it possible to do that in R?
> R-help at r-project.org mailing list
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
David Winsemius, MD
West Hartford, CT
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