Bar graph text stacked in R

Question

Bar graph text stacked in R

Asked 9 years, 3 months ago

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3

I want to create a stacked bar chart similar to the one below

I used the following command

barplot(t(dadosAQI),
        xlab="%",
        col=colAQI,
        horiz = TRUE,
        cex.axis = 0.8,
        cex.names = 0.8,
        las=1
        )

But I can’t add the text inside the bars. How to do this?

Rodrigo, you can post a reproducible part of your data using dput? You will probably need to use the command text and select position x based on data values.

– Molx

2015/09/15 at 15:00
@Moix, I tried to save the result of the barplot to use with the text, it was not efficient. The output of dput was: Structure(list(TMV = c(33.5621055191536, 15.6754220751383, 36.7551724422255, 16.3251895118863), TCF = c(65.562027434103, 83.015129105287, 62.0678120301, 82.3751677678634), Tcz = c(0.875867046743407, 1.30944881957463, 1.1770155067444, 1.29964272025029)), . Names = c("TMV", "TCF", "Tcz"), Row.Names = c("430°C - 1°C/min", "430°C - 5°C/min", "530°C - 1°C/min", "530°C - 5°C/min"), class = "frame date.")

– Rodrigo Simetti

2015/09/15 at 15:10

2 answers

2

To do this using barplot() and text(), you need to extract the x and y positions of each value you want to plot.

For the values of y, we will use the value returned by the function itself barplot
For the values of x, we have to put each value in the center of its bar. So, the position is half the value + the values of the bars on the left.

I only made it for the first two groups, because obviously the third would not fit. But you can edit x manually to choose a position that you like. I also removed the argument col since you did not put your definition, but just enter again.

Complete code:

dadosAQI <- structure(list(TMV = c(33.5621055191536, 15.6754220751383, 36.7551724422255, 16.3251895118863), TCF = c(65.562027434103, 83.015129105287, 62.0678120510301, 82.3751677678634), TCz = c(0.875867046743407, 1.30944881957463, 1.1770155067444, 1.29964272025029)), .Names = c("TMV", "TCF", "TCz"), row.names = c("430°C - 1°C/min", "430°C - 5°C/min", "530°C - 1°C/min", "530°C - 5°C/min"), class = "data.frame") 

par(mar=c(5,7,2,2))
bp <- barplot(t(dadosAQI), xlab="%", horiz = TRUE,
        cex.axis = 0.8, cex.names = 0.8, las=1) 

xpos <- c(dadosAQI[,1]/2, dadosAQI[,1] + dadosAQI[,2]/2)

text(x = xpos, y = bp, label = round(unlist(dadosAQI[,1:2]), 2)) #Temos que arredondar para não plotar várias casas decimais.

Upshot:

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by Daniel Falbel • **12,504** points · Answer 1 · 2015-09-15T15:28:25+00:00

You can try this using the ggplot2. I made an example that you can try to adapt to your data:

1. Creating the database:

dados <- data.frame(
  nomes = c("A", "A", "B", "B"),
  tipo = c("C","D","C","D"),
  valor = c(10,5,10,5),
  posicao = c(12,7,12,7)
)

2. Graph:

ggplot(dados, aes(x = nomes, y = valor, fill = tipo)) + 
  geom_bar(stat = "identity") + 
  geom_text(aes(y = posicao, label = nomes), colour = "white") +
  coord_flip()

Note that the column position in the database is the one that indicates the beginning of the text. In your case, you may need to adjust it manually.