plot stacked bar plot in R

Question

I would like to create histogram [stacked bar plot] in R with data like this:

Period = c(1,1,2,2,3,3,4,4)                              
Sample = c("A","B","A","B","A","B","A","B")
Value1 = c(3,2,6,7,3,2,1,2)
Value2 = c(1,0,5,2,2,0,2,5)
x <- data.frame(Period,Sample,Value1,Value2)

Is it possible to have "Period" and "Sample" on the X axes and The values ("Value1" and "Value2") in "Stacked Bar Plot". So the hight of first histogram would be 4 (separate for Value1 and Value2) Thank you for your help in advance! Best regards.

Why do you call this a histogram - you even mention a barplot in your Q, which is what you seem to want. These are not the same thing. — Gavin Simpson, Sep 28 '11 at 12:52
hints: `?rbind` to construct a matrix of the values. `?barplot`, paying careful attention to the `height` argument, for the stacked bar plot itself. — Ben Bolker, Sep 28 '11 at 13:12

Andrie · Answer 1 · 2011-09-28T13:34:28.350

21

You are describing a stacked bar chart, not a histogram. With ggplot you can do it as follows:

library(ggplot2)
library(reshape2)

x <- data.frame(
  Period = c(1,1,2,2,3,3,4,4),
  Sample = c("A","B","A","B","A","B","A","B"),
  Value1 = c(3,2,6,7,3,2,1,2),
  Value2 = c(1,0,5,2,2,0,2,5)
)

mx <- melt(x, id.vars=1:2)
ggplot(mx, aes(x=Period, y=value, fill=variable)) + 
  geom_bar(stat="identity") + 
  facet_grid(~Sample)

enter image description here

edited Sep 28 '11 at 13:34

answered Sep 28 '11 at 13:17

Andrie

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http://stackoverflow.com/questions/6851522/how-do-i-plot-a-stacked-bar-with-ggplot – Ben Bolker Sep 29 '11 at 22:23

score 7 · Accepted Answer · answered Sep 28 '11 at 14:32

7

It's not as pretty as the ggplot solution but

v <- rbind(Value1,Value2)
barplot(v,beside=FALSE,names=levels(interaction(Period,Sample)),legend=TRUE)

seems to work.

answered Sep 28 '11 at 14:32

Ben Bolker

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plot stacked bar plot in R

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