Stacked bar chart

Question

I would like to create a stacked chart using ggplot2 and geom_bar.

Here is my source data:

Rank F1     F2     F3 1    500    250    50 2    400    100    30 3    300    155    100 4    200    90     10 

I want a stacked chart where x is the rank and y is the values in F1, F2, F3.

# Getting Source Data   sample.data <- read.csv('sample.data.csv')  # Plot Chart   c <- ggplot(sample.data, aes(x = sample.data$Rank, y = sample.data$F1))   c + geom_bar(stat = "identity") 

This is as far as i can get. I'm not sure of how I can stack the rest of the field values.

Maybe my data.frame is not in a good format?

Answer 1

You need to transform your data to long format and shouldn't use $ inside aes:

DF <- read.table(text="Rank F1     F2     F3 1    500    250    50 2    400    100    30 3    300    155    100 4    200    90     10", header=TRUE)  library(reshape2) DF1 <- melt(DF, id.var="Rank")  library(ggplot2) ggplot(DF1, aes(x = Rank, y = value, fill = variable)) +    geom_bar(stat = "identity") 

Answer 2

You said :

Maybe my data.frame is not in a good format?

Yes this is true. Your data is in the wide format You need to put it in the long format. Generally speaking, long format is better for variables comparison.

Using reshape2 for example , you do this using melt:

dat.m <- melt(dat,id.vars = "Rank") ## just melt(dat) should work 

Then you get your barplot:

ggplot(dat.m, aes(x = Rank, y = value,fill=variable)) +     geom_bar(stat='identity') 

But using lattice and barchart smart formula notation , you don't need to reshape your data , just do this:

barchart(F1+F2+F3~Rank,data=dat)