change labeling x axis boxplot in ggplot

Question

I am quite new in ggplot and I have a question to relabelling the x-axis when I use boxplots.

  mat <- as.data.frame(cbind(sample(1:120,5000, replace = TRUE), rnorm(500)))
  colnames(mat) <- c("category","value")
  mat$category <- as.factor(mat$category)

  library(ggplot2)

  p <- ggplot(mat, aes(x=category, y=value)) +
    geom_boxplot() + 
    theme_classic() +
    theme(axis.text.x = element_text(angle = 90, hjust = 1)) + 
    xlab("Category") + 
    ylab("Value in units")
  p

The problem is the x-axis as the numbers are difficult to read. My idea is to use a kind of sequence to have fewer numbers or in boxplot case fewer categories written on the x-axis.

My question is where to include something like the following sequence

new_x_labeling = c(1,seq(10,120,5))

I found just answer about changing names in

How to change x-axis tick label names, order and boxplot colour using R ggplot?

but I have no clue how to reduce the number of names.

https://rstudio-pubs-static.s3.amazonaws.com/3364_d1a578f521174152b46b19d0c83cbe7e.html

utubun · Accepted Answer · 2018-12-03 09:54:45Z

2

Something like that probably:

  ggplot(mat, aes(x=category, y=value)) +
    geom_boxplot() + 
    scale_x_discrete(breaks = c(1, seq(10, 120, 5))) +
    theme_classic() +
    theme(axis.text.x = element_text(angle = 90, hjust = 1)) + 
    labs(x = "Category", y = "Value in units")

edited Dec 3, 2018 at 9:54

answered Dec 3, 2018 at 9:50

utubun

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2 Comments

smurfit89 Over a year ago

Never thought that was thateasy. I have tried scale_x_discrete( c(1, seq(10, 120, 5))) and nothing happened.

utubun Over a year ago

Yes, sometimes the ggplot2 grammar is not so intuitive, as I'd wish it to be.

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