Re: Barplot : order bar by input name

[Doug Mitarotonda]

Hi Alexandre,

You need to specify the order of the levels of Sex (be default it is lexicographic so Female is first). So replace what you have with:

Sex = factor(c("Male", "Female", "Male", "Female", "Male", "Female", "Male", "Female"), levels = c("Male", "Female"))

For the base boxplot, you need something like:

ggplot(frameEcto, aes(x = Sex, y = FPKM, fill = Compartment)) + geom_boxplot()

Best wishes,

Doug

On Feb 7, 2013, at 7:21 AM, Alexandre Cormier <cormiera...@gmail.com> wrote:

Hi all,

Sorry, I'm a beginner with ggplot2 and my question is probably stupid...

In my barplot, I would like this order : male and female for each compartment. I looked in ggplot2 documentation to try to do this but without success :S

My code looks like that :

frameEcto=data.frame(Compartment = factor(c("Autosomes", "Autosomes", "PAR", "PAR", "SDR_M", "SDR_M", "SDR_F", "SDR_F")),
                     FPKM = c(33.43, 34.77, 11.09, 12.57, 16.13, 0.00, 0.00, 18.34),
                     Sex = factor(c("Male", "Female", "Male", "Female", "Male", "Female", "Male", "Female"))
                     )

limits <- aes(ymax = FPKM + (5*FPKM/100), ymin=FPKM - (5*FPKM/100))

And for the graphical part :

dodge <- position_dodge(width=0.9)
barplots <- ggplot(frameEcto, aes(fill=Sex, y=FPKM, x=Compartment)) +
  geom_bar(position="dodge", stat="identity") +
  scale_fill_manual(limits=c("Male","Female"), values = c("cornflowerblue", "hotpink1")) +
  scale_x_discrete(limits=c("Autosomes","PAR","SDR_M","SDR_F"), labels = c("Autosomes" = "Autosomes","PAR" = "PAR", "SDR_M" = "Male SDR","SDR_F" = "Female SDR")) +
  #labs(title = "Average genes expression level in autosomes, PAR and SDR for each sex") +
  ylim(0,40)

barplots + geom_bar(position=dodge) + geom_errorbar(limits, position=dodge, width=0.25)

If I well understood, the "aes(fill=)" works by returning the sex vector values by alphabetical order and is a problem for me. I tried to use the "scale_fill_manual" function but I'm not sur that is the good way to use that (apparently not, there is not effect on the barplot result...).

If someone has a solution, let me know!

Best

Alexandre

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<barplot.png>

[Alexandre Cormier]

Hi Doug,

Thanks for this rapid answer. This solves my problem !

Best,

Alexandre