R中的堆积条形图

Question

I have a csv file like below, I want to make a stacked bar plot that x-axis is link column and and y-axis shows the frequency and each bar is grouped based on Freq_E and Freq_S. when I read the csv and give it to barplot it doesn't work. I searched a lot but all examples data is in form of contingency table. I donno what should I do...

           link  Freq_E  Freq_S
1          tube.com 214 214
2          list.net 120 120
3          vector.com 119 118
4          4cdn.co  95  96

Answer 1

"It doesn't work" is not an error message in R that I'm familiar with, but I'm guessing your problem is that you are trying to use barplot on a data.frame while you should be using a matrix or a vector .

Assuming your data.frame is called "df" (as defined at the start of Codoremifa's answer), you can try the following:

x <- as.matrix(df[-1])   ## Drop the first column since it's a character vector
rownames(x) <- df[, 1]   ## Add the first column back in as the rownames
barplot(t(x))            ## Transpose the new matrix and plot it

Answer 2

You should look at the excellent ggplot2 library, try this code snippet for your example -

df <- read.table(textConnection(
'link  Freq_E  Freq_S
tube.com 214 214
list.net 120 120
vector.com 119 118
4cdn.co  95  96'), header = TRUE)

library(ggplot2)
library(reshape2)

df <- melt(df, id = 'link')
ggplot(
   data = df,
   aes(
      y = value, 
      x = link, 
      group = variable, 
      shape = variable, 
      fill = variable
   )
) +
geom_bar(stat = "identity")