On Mon, Jan 16, 2012 at 1:13 AM, Paul <p...@paulhurley.co.uk> wrote: > On 16/01/12 02:08, J Toll wrote: >> Hi, >> >> I'm trying to create a stacked bar plot using ggplot2. Rather than >> plotting the count of each of the 13 "Bar" factors on the Y axis, I >> would like to represent the sum of the Values associated with each of >> the 13 "Bar" factors. Is there a way to do that? Given the following >> data, that would obviously mean that there would be some negative sums >> represented. Here's a bit of example data along with the command I've >> been using. >> >>> library(ggplot2) >>> x >> Value Bar Segment >> 1 1.10020075 1 1 >> 2 -1.37734577 2 1 >> 3 2.50702876 3 1 >> 4 0.58737028 3 2 >> 5 0.21106851 3 3 >> 6 -2.50119261 4 1 >> 7 1.34984831 5 1 >> 8 -0.27556149 6 1 >> 9 -1.54401647 6 2 >> 10 -2.75975562 6 3 >> 11 -0.09527123 6 4 >> 12 1.36331646 7 1 >> 13 -0.36051429 8 1 >> 14 1.36790999 9 1 >> 15 0.15064633 9 2 >> 16 0.34022421 9 3 >> 17 -0.64512970 10 1 >> 18 0.83268199 11 1 >> 19 -1.50117728 12 1 >> 20 1.09004959 13 1 >>> qplot(factor(Bar), data = x, geom = "bar", fill = factor(Segment)) >> Thanks for any suggestions you might have. >> >> James >> >> ______________________________________________ >> 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. > I'm not at my usual computer, but in ggplot2 the geom_bar geom is > designed for stats, so by default does report count. You can change the > stat method (ie to identity to just use the values in the column) but > the easiest (IIRC) is to give a weight; > > #Gives count > || > > qplot <http://had.co.nz/ggplot2/qplot.html>(color, data=diamonds, > geom="bar") > > #Gives sum of carat variable > qplot <http://had.co.nz/ggplot2/qplot.html>(color, data=diamonds, > geom="bar", weight=carat, ylab="carat") > > #just gives raw values from meanprice column > || > > qplot <http://had.co.nz/ggplot2/qplot.html>(cut, meanprice, geom="bar", > stat="identity") > > Check out the ggplot2 help page (http://had.co.nz/ggplot2/geom_bar.html) for > more info. > > Regards, > > Paul. >
Paul, Thank you for the help. Using your second example, I added "weight = Value" to my previous command to get the chart I wanted. qplot(factor(Bar), data=x, geom="bar", weight = Value, fill=factor(Segment)) ggplot2 issues a warning message with my data because it has negative values: "Warning message: Stacking not well defined when ymin != 0 " But that's not a real concern. Anyway, thanks again for your help. James ______________________________________________ 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.
