grouped bar graph

Question

I have the following data:

bin groupname   total_dist
0   rowA    377
0   rowA    306.6
0   rowB    2.1
0   rowB    110.6
1   rowA    918.1
1   rowA    463.2
1   rowB    798.2
1   rowB    1196
2   rowA    1295.1
2   rowA    1269.1
2   rowB    698
2   rowB    1022.1

Using R, I want to make a bar graph where there is a bar for rowA and a bar for rowB for each bin. I can group total_dist by one or the other (plot(total_dist~bin) or plot(total_dist~groupname)). But I can't figure out how to combine them.

I want something that looks similar to this example: example grouped bar graph

could you specify better? in the lower graph example, EUL, PES, EFA ... are the bins? the example has 2 bars per group ... "two bars" corresponds to rowA/rowB, groups to? we have two values per rowX, so we have 4 values for bin, so we should have 4 bars per "group"? (instead of 2 of the example..)?? please could you sketch how you want it really? — ShinTakezou, Jun 09 '10 at 15:29
have you to "group" the doubles (rowA rowA, rowB rowB) into a single value so that you've have 2 bars per bin instead of 4? and how do you "combine" total_dist in the same bin and with same groupname (sum? mean?) — ShinTakezou, Jun 09 '10 at 15:50
@ShinTakezou: If my data were mapped to the example graph, bin=>group and groupname=>year. So bin would be the x-axis labels and groupname would correspond to the column colouring. — dnagirl, Jun 09 '10 at 16:16
you have 4 values per bin, how do you want to group them? or should them remain separatd? — ShinTakezou, Jun 09 '10 at 16:19

score 29 · Accepted Answer · edited Feb 08 '17 at 14:26

Here is a classic solution. (Supposing your dataframe is named df )

data <- tapply(df$total_dist, list(df$groupname,df$bin), sum)

barplot(data,beside=T,col=c("#ee7700","#3333ff")
,main="European Parliament Elections",xlab="Group",ylab="Seats")

legend(locator(1),rownames(data),fill=c("#ee7700","#3333ff"))

and here is solution using ggplot2

library(ggplot2)
qplot(factor(bin),data=df,geom="bar",fill=groupname,weight=total_dist,position="dodge",
main = "European Parliament Elections", xlab="Group",ylab="Seats")

alt text

grouped bar graph

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